Adjustable steering column with anti-overturning structure

The adjustable steering column comprises an upper sleeve combination, an upper mounting plate combination, a lower sleeve, a mounting rotating pin and a locking mechanism, the upper mounting plate combination comprises an upper mounting plate, a U-shaped plate and a positioning safety block, the U-shaped plate is fixedly mounted at the bottom of the upper mounting plate, and the positioning safety block is fixedly mounted at the bottom of the upper mounting plate. The positioning safety blocks are arranged on the two sides of the upper mounting plate, the steering column is mounted on a frame through the mounting rotating pin at the lower end and the positioning safety blocks at the upper end, the upper sleeve combination comprises an upper sleeve and an input shaft, and the U-shaped plate clamps the upper sleeve through the locking mechanism to enable the steering column to form a whole. And an anti-overturning mechanism is arranged between the upper sleeve combination and the upper mounting plate combinatio