Cantilever Air Expanding Shaft And Double-shaft Head Inflatable Shaft

The surface of the cantilever inflatable chuck is similar to that of the convex key inflatable shaft, with multiple convex keys (slats are not common), and the force is dispersed to each independent convex key, with large expansion force, strong grasping force, uniform force, and the external pipe is not easy to deform. Flange mounting on the end face of the rack can replace ordinary inflatable shafts, and cantilever inflatable chucks are the ideal solution when optimal centering of the shaft is required. It can achieve the purpose of transmitting high torque values or high-speed operation, and the vibration is very small when running at high speeds.

The structure of the double-shaft head inflatable shaft is not much different from that of the ordinary inflatable shaft, and the shaft heads at both ends of the double-shaft head inflatable shaft are locked on the equipment frame through safety chucks or flanges to form a full support structure. The new generation of twin-head inflatable shaft tubes is made of carbon fiber composite material with a stainless steel mesh reinforcement layer, which has a tensile strength of 1,500-2,000 MPa (20%-100% higher than steel) and a weight reduction of 70%-80%.

Composition:
The cantilever inflatable shaft is a single-axis head and is a unilateral support structure, while the double-shaft head inflatable shaft is a bilateral support. Therefore, the installation method of the cantilever inflatable shaft only needs to be fixed on one side of the shaft head, and the other end is in a suspended state, and the overall structure is supported by the cantilever support; The double-shaft head inflatable shaft is mounted and fixed on both sides of the shaft head, and is usually locked with a safety chuck.

Comparison of advantages:
The core advantages of the cantilever inflatable shaft:
(1) Fast loading and unloading: fast response to inflation and deflation, no need to disassemble the whole shaft.
(2) Anti-eccentric load design: The cantilever bracket enhances rigidity and reduces vibration (such as the high-speed operation of the slitting machine).
(3) Low cost: omit one side of the support structure, and the maintenance cost is low.

The core advantages of the double-shaft head pnematic expanable shaft:
(1) Ultra-high strength: The tensile strength of the carbon fiber shaft tube is increased by 20%-100%, and the pressure resistance ≥ 60MPa.
(2) Lightweight: Workers can handle it manually to reduce energy consumption.
(3) Strong stability: fixed on both sides to avoid coil shaking, suitable for precision coating/film production.

Applications:
Cantilever core expanding shaft is mostly used on equipment where the material is not too heavy, such as label die-cutting machine, round knife die-cutting machine; The double-shaft head inflatable shaft has a stronger load-bearing capacity, such as film blowing machine and bag making machine.

Suggestions for selection:
Scenario with cantilever shaft: limited space on the production line or frequent roll changes (e.g. label printing). When the width of the coil ≤ 2.3 m and the weight ≤ 1 ton. Budgets are limited, and you need to pursue high cost performance.
Scenario of inflatable shaft with twin shaft head: When the material is heavy coil (e.g. metal foil, thick film) or wide format (>2.5 m) production. High-precision tension control scenarios (e.g., optical film coating). Long-term continuous operation is required, emphasizing the durability of the equipment.

Contact factory in Guangdong, China

(Over 20 years experience in air shafts production )