A double parallelogram vertical lifting device, including:
- a linkage mechanism, including a first shaft seat, a second shaft seat, a third shaft seat, an upper support unit whose two ends are movably coupled to the first shaft seat and the second shaft seat, and a lower support unit whose two ends are movably coupled to the second shaft seat and the third shaft seat, wherein the upper support unit is provided with a first gear, and the lower support unit is provided with a second gear that meshes with the first gear;
- and
- a pushing device, one end of which is set on the upper support unit, and another end of which is set on the lower support unit;
- wherein, the upper support unit has a first connecting arm assembly and a second connecting arm assembly arranged in parallel with each other between the first shaft seat and the second shaft seat, and two ends of the first connecting arm assembly and the second connecting arm assembly are movably coupled to the first shaft seat and the second shaft seat to form a parallelogram on both sides of the first shaft seat and the second shaft seat respectively;
- and the lower support unit has a third connecting arm assembly and a fourth connecting arm assembly arranged in parallel with each other between the second shaft seat and the third shaft seat, and two ends of the third connecting arm assembly and the fourth connecting arm assembly are movably coupled to the second shaft seat and the third shaft seat to form a parallelogram on both sides of the second shaft seat and the third shaft seat respectively;
- wherein the first connecting arm assembly has a first upper connecting arm, a second upper connecting arm, and a first upper shaft body and a second upper shaft body connecting the first upper connecting arm and the second upper connecting arm;
- the second connecting arm assembly has a third upper connecting arm, a fourth upper connecting arm, and a third upper shaft body and a fourth upper shaft body connecting the third upper connecting arm and the fourth upper connecting arm;
- one end of the first upper connecting arm and the second upper connecting arm is movably coupled to both sides of the first shaft seat by the first upper shaft body;
- another end of the first upper connecting arm and the second upper connecting arm is movably coupled to both sides of the second shaft seat by the second upper shaft body;
- one end of the third upper connecting arm and the fourth upper connecting arm is movably coupled to both sides of the first shaft seat by the third upper shaft body;
- and another end of the third upper connecting arm and the fourth upper connecting arm is movably coupled to both sides of the second shaft seat by the fourth upper shaft body, so that the first upper connecting arm and the third upper connecting arm form a parallelogram on one side of the first shaft seat and the second shaft seat, and the second upper connecting arm and the fourth upper connecting arm form a parallelogram on another side of the first shaft seat and the second shaft seat.