Compressed gas spring (support rod)
The working principle of the gas spring is to use inert gas as the elastic medium, and use oil (such as transformer oil and turbine oil 50% each) to seal and lubricate and transmit pressure. It is actually a variant of the sleeve type air spring, which was also developed to further improve the elastic characteristics of the sleeve type air spring. Therefore, he also has the general characteristics of air spring structure. Gas springs are generally composed of cylinders, pistons (rods), seals and external connectors. High-pressure nitrogen or inert gas and oil form a circuit in the cylinder. The damping on the piston makes the rod chamber and the rodless chamber communicate, so that the pressure in the two chambers is equal. The elastic force is generated by the difference in the force-bearing area of the two chambers and the compressibility of the gas.
The gas spring has a light structure and a large working stroke; the movement is smooth and can act as a damping buffer; it has a stable and nearly unchanged characteristic line; it is easy to operate, safe and reliable. But the processing cost is higher.
FG — Support gravity
n — number of air springs
LG — Distance from center of gravity to center of rotation
k — safety factor: 1.1--1.15
F1 — minimum stretching force
L1 — The effective arm with the air spring extended
Gas spring force curve