The air expansion shaft is a special winding and unwinding shaft. After high-pressure inflation, the surface part can expand. It has the following five characteristics:

(1) The paper tube is placed simply: with the action of inflation and deflation, it can move and fix any position of the paper tube on the shaft surface.

(2) High economic efficiency: the shaft is designed for special functions, which can be used for all kinds of paper tubes that are thick, thin, wide and narrow.

(3) Large bearing capacity: the size of the shaft diameter can be determined according to the actual needs of customers, and high strength steel can be used to increase the bearing capacity.

(4) Simple maintenance and long service life: the air expansion shaft is a single part, and each part in its structure has a fixed specification, which can be interchanged for easy maintenance.

(5) The inflation operation time is short. It takes only 3 seconds to separate and place the inflation shaft and the paper tube to complete inflation and deflation, and it does not need to separate any parts at the end of the shaft to tightly engage with the paper tube.