The free-type nitrogen rod has the function of support and thrust, but not the function of positioning. The interior is filled with nitrogen of appropriate pressure, so that the nitrogen rod generates a reaction force when compressed. This reaction force can be used to support or counteract the heavy load on the air rod, and use the oil volume inside the cylinder and the size of the piston hole to produce a damping effect. Promoting the nitrogen rod in the process of stretching or compressing can ensure the smooth movement of the cylinder.
It is generally recommended to install the nitrogen rod with the shaft center down, so that the nitrogen rod can have a cushioning effect when it is stretched to the end, and can protect the designed mechanism. Therefore, free-type nitrogen rods are often used in automatic equipment lift doors, lift covers, especially sheet metal industrial box lift doors, car hoods and tailgate lifts, furniture kitchen cabinets, electronic equipment lift doors, industrial machinery, machine tool lift doors, etc. .

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