Automatic rotation mechanism

The invention discloses an automatic rotation mechanism which comprises a motor (1), a speed reducing mechanism (2), a movable gear box (4), a bottom plate (10) and a wheel (18). The motor (1) is connected with the speed reducing mechanism (2), and the speed reducing mechanism (2) is fixed on the bottom plate (10). The automatic rotation mechanism is characterized in that a pressure spring (5), a positioning shaft (6), a small gear (7) and a large gear (8) are arranged in the movable gear box (4), the small gear (7) is arranged in the positioning shaft (6) and is driven by the speed reducing mechanism (2), the large gear (8) is matched with the small gear (7), a transmission shaft (9) is arranged in the middle of the large gear (8), the wheel (18) is mounted on the transmission shaft (9), and one end of the pressure spring (5) is fixed on the positioning shaft (6). The automatic rotation mechanism has the advantages of simple structure, small size, easiness in movement and position change, simplicity and conv