Omnidirectional telescopic frame type projection device for class recording

An omni-directional telescopic frame type projection device for class recording is characterized in that four groups of universal wheels with brakes are arranged at the bottom of a cuboid main structure frame, and a longitudinal telescopic rod I, a longitudinal telescopic rod II, a longitudinal telescopic rod III and a longitudinal telescopic rod IV are respectively arranged on the left side and the right side between a front telescopic frame and a rear telescopic frame of the main structure frame; a vertical electric push rod is arranged between the second longitudinal telescopic rod and the third longitudinal telescopic rod, and a connecting rod is arranged between the first longitudinal telescopic rod and the second longitudinal telescopic rod. The front telescopic frame is formed by arranging a first front transverse telescopic rod and a second front transverse telescopic rod between two front vertical telescopic rods, clamping grooves with opposite openings are formed in movable rods of the two front ver