Uniform-expansion air expansion shaft and production process thereof

Abstract

The invention discloses a uniform-expansion air expansion shaft. The air expansion shaft comprises a shaft tube body and shaft heads symmetrically arranged at the two ends of the shaft tube body, an air expansion cavity is formed in the shaft tube body, a plurality of bearing assemblies are uniformly arranged at the outer side of the shaft tube body in the radial direction, and each bearing assembly comprises a fixed beam arranged in the axial position of the shaft tube body; and each fixed beam is fixedly arranged on the shaft tube body through a plurality of screws, a plurality of idler wheels are evenly and rotationally arranged on each fixed beam through pin shafts, the axes of the idler wheels are perpendicular to the axis of the shaft tube body, and the portion, between every two adjacent bearing assemblies, of the shaft tube body is provided with an air expansion key bar assembly. Each air expansion key bar assembly structurally comprises a cover plate fixedly arranged at the axial position of the shaft tube body, and a plurality of piston cavities are evenly formed at the portion, at the inner side of each cover plate, of the shaft tube body.

Description

technical field [0001] The invention relates to the technical field of shafts, in particular to an inflatable shaft with uniform expansion and a production process thereof. Background technique [0002] All machines with winding, unwinding, and slitting generally use an inflatable shaft. The inflatable shaft is a shaft whose surface can protrude after high-pressure inflation, and the surface part retracts quickly after deflation. In the prior art, the staff sets the core of the coiled material outside the inflatable shaft, and inflates the inflatable shaft. The surface of the inflated shaft protrudes and presses against the core of the coiled material. After winding the product, the gas in the inflatable shaft is discharged and the surface protrusion of the inflatable shaft is reset, so that the core of the coil can be unloaded. The existing inflatable shaft inflatable key bar cannot achieve high coaxiality when propped up, the inflated height is uneven, and the expansion i...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides an inflatable shaft with uniform expansion and its production process, which solves the problem that the existing inflatable shaft cannot achieve high coaxiality when the inflatable key bar is propped up. The swelling height is uneven and the expansion is uneven, which will easily lead to large jumps during the winding process of the core, and more seriously, it will also cause damage to the air shaft, which is a certain dangerous problem.

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