Light expansion shaft

Abstract

The invention discloses a light expansion shaft which comprises a supporting pipe and an expansion pipe, wherein the supporting pipe is sleeved with the expansion pipe. The two ends of the expansion pipes are fixed to the supporting pipe in a sealed mode. The supporting pipe is of a hollow structure and the two ends of the supporting pipe are sealed. Vent holes communicated with the hollow structure are formed in the side wall of the supporting pipe in a penetrating mode. A gas inlet communicated with the hollow structure is further formed in the supporting pipe. When the light expansion shaft is used, the expansion pipe is sleeved with a center coiling block of a film-shaped material, pressure gas flows to the hollow structure of the supporting pipe through the gas inlet, the pressure gas enters a gap between the expansion pipe and the supporting pipe through the vent holes, so that the expansion pipe is expanded and attached to the center coiling block, the center coiling block is prevented from slipping, the expansion pipe returns to normal after the gas inside the supporting pipe is released, and the center coiling block can be conveniently taken down. The light expansion shaft is simple in structure, light in total weight, convenient to operate and capable of greatly reducing the number of operators, relieving labor intensity, improving labor efficiency and effectively solving the problem that deviation of coaxiality of the film-shaped material and the expansion shaft is too large in the prior art.

Description

technical field [0001] The invention relates to a light-duty expanding shaft, in particular to an expanding shaft used for tightening the central reel of the film-shaped material when the film-shaped material is wound and discharged in the electronics industry. Background technique [0002] A large number of film-like materials are used in the electronics industry. When winding and unwinding various film-like materials, the central reel of the film-like material must be placed on the shaft of the winding and unwinding equipment. The shaft has a certain pre-tightening force, so as to provide a winding and unwinding tension for the film material, and prevent the central roll of the film material from slipping. For this reason, the diameter of the shaft on the winding and unwinding equipment is required to be changed, so that it can expand during winding and unwinding to tighten the central reel; and it can be reduced after the completion of rewinding and unwinding. , so as to...

AI Technical Summary

Problems solved by technology

Among them, the key-type pneumatic expansion shaft has an inner expansion tube inside it and a plurality of protruding key strips. When in use, it is injected with air pressure, and the internal expansion tube expands outwards to push up the key strips, so that the key strips expand and tighten the membrane. The central reel of the shape material, but this kind of expansion shaft is easy to deform the outer pipe, and the coaxiality is not easy to control, and the expansion shaft except the inner expansion tube, the rest of the parts are made of metal processing, so that the entire expansion shaft It is too heavy, generally requires at least two employees to operate, and it is extremely inconvenient to use

The mechanical expansion shaft generally uses the screw to drive the conical block for expansion, but because the pitch of the screw cannot be too large, it needs to rotate many turns when expanding the central reel to meet the use requirements, and the operation time is longer and the efficiency is reduced.

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