Stable position-controllable opening and closing platform

The stable position-controllable opening and closing platform comprises a bearing plate, a servo motor is arranged below the bearing plate, the top face of the bearing plate is connected with two limiting plates, an opening and closing control plate is arranged between the two limiting plates, a transmission shaft of the servo motor is connected with a swing rod, and the end, away from the servo motor, of the swing rod is connected with a shaft rod; an opening and closing control plate is connected to the shaft rod, two rows of kidney-shaped grooves are formed in the top face of the opening and closing control plate, the kidney-shaped grooves in the two sides incline in the direction away from the middle kidney-shaped groove, and the inclination angles are the same. Opposite notches are formed in the two limiting plates, the widths of the notches are gradually increased from the middle to the two sides, and opening and closing plates are arranged on the two opposite notches. In the swinging process of the ope