The lifting mechanism based on 4 bars-linkage mechanism to ensure the lifting tip usually parallel to the ground.
Lead screw is driving the lifting jack up/down movements.
** the screw lifting jack is very common on the cars tool set, it can lift the car weight by hand to change the tires.
Mechanism Calculations
These formulas explain how to control the positions of mechanism and then the force analysis applied on the lifting jack.
Mechanism Kinematics control formula
The equation provides the Number of Turns of lead screw (N) when input the Total Height of mechanism (H).
Download Mechanism Calculator👇👇
Force Analysis
As shown in the previous figure the Force (F) produced from lead screw mechanism to be able to lift Load (W), by using the triangle with theta angle.
** Consider there are two forces from right and left against the Load (W)
During mechanism operation the angle theta changes from initial value = 1 degree to increase up to the mechanism limitation, So the Force that produced from lead screw decreasing along time during operation as shown in previous figure.
Comentarios