Gas spring is a kind of industrial accessory that can be used for support, buffer, brake, height adjustment and angle adjustment, etc. It consists of the following parts: pressure cylinder, piston rod, piston, sealing guide sleeve, filling (inert gas or oil and gas mixture). It consists of the following parts: pressure cylinder, piston rod, piston, sealing guide sleeve, filler (inert gas or oil and gas mixture), cylinder control element and cylinder control element (refers to the controllable gas spring) and joints and so on. The principle is in a closed pressure cylinder filled with inert gas or oil and gas mixture, so that the pressure in the cavity is higher than the atmospheric pressure of a few times or dozens of times, the use of the piston rod cross-sectional area is smaller than the cross-sectional area of the piston and thus the resulting pressure difference to achieve the movement of the piston rod. Because of the fundamental difference in principle, gas springs have significant advantages over ordinary springs: relatively slow, dynamic force changes (generally within 1:1.2), easy to control. The disadvantages are that they are not as small as coil springs, they are costly and have a relatively short service life. Unlike mechanical springs, gas springs have a nearly linear elasticity curve. The elasticity coefficient X of a standard gas spring is between 1.2 and 1.4, and other parameters can be flexibly defined according to the requirements and working conditions.