What is Air Expansion Shaft ?

The structure of Air Expansion Shaft

The air expansion shaft shaft consists of three main parts: the shaft body, bearings, and airtight sealing device. The shaft body is the main part of the inflation shaft, which consists of an inflation shaft tube, a shaft core, and a shaft head. Air shaft tubes are usually made of aluminum alloy or stainless steel, with high strength and corrosion resistance. The shaft core is the core part of the air expansion shaft, which consists of an internally ventilated inflation shaft tube and an externally fitted shaft head with bearings. Shaft heads are usually made of cast iron or steel, with high hardness and wear resistance. The diameter and length of the shaft core are determined based on the usage scenario and the required load-bearing capacity.

Bearings are an important component of the air expansion shafts, used to support the rotational motion of the shaft core. Bearings are usually composed of ball bearings or roller bearings, which can withstand large radial and axial loads. The outer and inner diameters of bearings are determined based on the size of the shaft core and the intended use.

The airtight sealing device is used to ensure the internal airtightness of the inflation shaft. It usually consists of an airtight sealing ring and an airtight sealing gasket, which can effectively prevent gas leakage and external impurities from entering. The material and structure of the airtight sealing device are determined according to the type and pressure of the gas used.

Working Principle of Air Expansion Shaft

The working principle of the air   expansion shaft is based on the principle of the pump method, which uses high-pressure gas to drive the rotational motion of the shaft core. When the inside of the inflation shaft is filled with high-pressure gas, the gas will flow into the shaft head through the internal channel of the shaft core, and then reach the outside of the shaft core through the bearing, forming a gas film. When the shaft core rotates, the gas film also rotates, generating shear force and driving the rotational motion of the shaft core.

The working pressure of the air shaft is usually between 0.2 and 1.2 MPa, which can be adjusted according to different application scenarios and requirements. The inflatable shaft has the advantages of high efficiency, environmental protection, and energy saving, and is suitable for various mechanical equipment with light load, high speed, and high precision requirements.

The Type of Air Expansion Shaft

1. Key/Lug Type Air Expansion Shaft

The main body of the shaft is made of high-quality steel pipe, chrome plated on the surface, and aluminum protruding keys are flexible in expansion and contraction; Equipped with high-quality rubber inner liner and fast charging and discharging air nozzle, it has good sealing effect, long service life, detachable shaft head, and easy maintenance. The key type air expansion shaft expands a single key strip, and the fulcrum spreads to each key strip to balance the force. After inflation, it expands unilaterally and can be used for mechanical winding of heavy load-bearing items.

2. Leaf Type Air Expansion Shaft

The expansion part is a plate with evenly distributed support points and uniform force distribution, which can be used for mechanical winding with high precision or for winding lighter items.