Lifting column transmission assembly and lifting column

A lifting column, comprising a transmission assembly, an inner tube and an outer tube which are sequentially sleeved from inside to outside, wherein the transmission assembly includes a hollow spindle having an outer thread, a transmission screw disposed in the hollow spindle, a sleeve sleeved over the hollow spindle, a guide tube limited in the sleeve, and an actuating device configured to drive the guide tube to rotate, wherein the guide tube and the hollow spindle are synchronously rotatable and axially expandable and retractable relative to each other, the transmission screw and the hollow spindle are synchronously rotatable and axially expandable and retractable relative to each other;

• the actuating device is disposed in the inner tube and securely mounted to an upper end of the sleeve;
• and a lower end of the sleeve is securely connected with a first transmission nut that is threadedly-fitted with the hollow spindle, the first transmission nut is securely coupled to the inner tube, and the upper end of the sleeve is movably disposed and unfixed.