Spiral-disc type variable-diameter shaft

Abstract

The invention provides an Archimedes spiral-disc type expansion shaft capable of adapting to the inner diameter of diaphragm drum with different diameter in a large range. A shaft-diameter adjustmentknob, sliders and an expanding piece are arranged on an expanding-piece seat of the expansion shaft. The expansion shaft is characterized in that a spiral disc with a plurality of Archimedes spirals is adopted to replace a general typical structure of combining helices with inclined planes in the prior art to promote the movement of the expanding piece and realize the change of shaft diameter; asdiaphragms of each type have certain width, two sliders (5) in a front position and a back position are adopted to drive the expanding piece (6) together; the expanding piece (6) is allowed to move inparallel along the width of a diaphragm (8); and in order to guarantee the synchronous movement of the front and back sliders (5), the structure with double Archimedes spiral discs (2) is adopted.

Description

Technical field: [0001] The invention relates to a helical disk type reducing shaft device, which can adapt to the inner diameters of diaphragm drums with different diameters in a relatively large range. Background technique: [0002] At present, the mechanical expansion shaft adopts the scheme of spiral and inclined plane, because the pitch of the screw should not be too large, and when the shaft diameter and the diameter of the material roll are relatively large, it is necessary to turn the handwheel many times to make the shaft and the material roll together. , the operation is very inconvenient. At the same time, the inclination of the inclined plane should not be too large, otherwise there will be problems of relative sliding of the mobile pair due to too large pressure angle, and reverse self-locking after the handwheel is released. Invention content: [0003] In order to overcome the inconvenience of the existing mechanical expansion shaft operation. At the same t...

AI Technical Summary

Problems solved by technology

[0002] At present, the mechanical expansion shaft adopts the scheme of spiral and inclined plane, because the pitch of the screw should not be too large, and when the shaft diameter and the diameter of the material roll are relatively large, it is necessary to turn the handwheel many times to make the shaft and the material roll together. , very inconvenient to operate

At the same time, the slope of the slope should not be too large, otherwise there will be problems of relative sliding of the mobile pair due to too large pressure angle, and reverse self-locking after the handwheel is released.

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