Numerical control grinding machine convenient for internal cleaning and used for machining flat key shaft

The utility model discloses a numerical control grinding machine used for machining a flat key shaft and facilitating internal cleaning, which comprises a support clamping frame, a connecting toothed plate, a cleaning device, a guide device and a servo motor, a servo motor is fixedly installed at the position, right opposite to the guiding device, of the rear end face of the supporting clamping frame, and a cleaning device is slidably clamped to the outer end face of the supporting clamping frame through the guiding device. By arranging the cleaning devices, the guide device can provide enough power for the two sets of cleaning devices during cleaning operation, so that the two sets of cleaning devices can conveniently and circularly move in the supporting clamping frame, and meanwhile, during displacement, high-frequency vibration can be performed through limiting of limiting clamping teeth and a connecting toothed plate; and therefore, the efficiency of cleaning the metal chips outside the grinding machine