LIFTING MECHANISM HAVING TWO LEADSCREWS

摘要

A lifting mechanism having two leadscrews comprises: a positioning plate (2); a positioning frame (4) located above the positioning plate (2); a lifting platform (6) provided between the positioning frame (4) and the positioning plate (2); at least one pair of leadscrews (8), the at least one pair of leadscrews (8) comprising a first leadscrew (82) and a second leadscrew (84), the first leadscrew (82) and the second leadscrew (84) being movably connected to the positioning frame (4) and the positioning plate (2), and the first leadscrew (82) and the second leadscrew (84) engaging with the lifting platform (6) in a helical transmission manner; a rotary drive assembly (10) provided on the positioning plate (2) or the positioning frame (4), the rotary drive assembly (10) comprising at least one driving shaft, a first synchronous transmission mechanism (12) being provided between the driving shaft and the first leadscrew (82), a second synchronous transmission mechanism (14) being provided between the first leadscrew (82) and the second leadscrew (84); and at least one tensioning assembly (16), wherein the tensioning assembly (16) is used to tension the second synchronous transmission mechanism (14). The lifting mechanism having two leadscrews performs lifting smoothly in a vertical direction. The lifting platform also has high repositioning precision, such that the levelness of the two-leadscrew lifting platform remains unchanged when subjected to a pre-tensioning force or a load change.