Expansion shaft

Abstract

The invention relates to an expansion shaft which is used for supporting and fixing a paper element core, and comprises an outer shaft sleeve, a plurality of cover plates and a telescopic mechanism, wherein the outer shaft sleeve is provided with a shaft sleeve surface and an inner shaft hole, the axial shaft sleeve surface is respectively provided with a first penetrating part and a second penetrating part, and the first penetrating part and the second penetrating part are respectively provided with a plurality of penetrating holes. The cover plates are arranged on the penetrating holes respectively. The telescopic mechanism is arranged in the inner shaft hole between the first penetrating part and the second penetrating part in a floating way so as to realize the fixed arrangement of each cover plate; when the telescopic mechanism stretches, each cover plate is pushed outwards radially from the axle center, so that all the cover plates protrude out of the surface of the shaft sleeve; and when the telescopic mechanism retracts, the cover plates return to the penetrating holes of the first penetrating part and the second penetrating part respectively. The expansion shaft can regulate the expansion capability automatically, so as to enable the expansion strength allocation at two sides to tend to be uniform, the structural design has high rigidity, a hydraulic cylinder is takenas a power source, and the expansion shaft has the characteristics of being capable of providing relatively greater expansion force and bearing high load.

Description

technical field [0001] The invention relates to an expansion shaft, in particular to a high-load expansion shaft capable of self-adjusting the expansion amount of the cover plates on both sides. Background technique [0002] Existing expansion shafts are mainly used to fix various paper core reels, so that steel strips, aluminum strips, stainless steel strips or other raw materials with high specific gravity can be directly taken up by the paper core reels. At present, the common expansion shaft is mainly pneumatic, such as China Taiwan Announcement No. 290521 and US Patent No. 6,196,494B1, which are mainly composed of an outer shaft sleeve, a telescopic block, and a telescopic mechanism. The inside of the slot can protrude outward or retract inward along the installation slot. The telescopic mechanism part mainly utilizes the expansion of the air bag, and the telescopic block protrudes to fix the reel. The power driven by this type of expansion shaft is pneumatic, and it i...

AI Technical Summary

Problems solved by technology

In addition, the Chinese Patent No. CN2561752Y also discloses a mechanical expansion shaft mechanism, which generates the expansion of the outer diameter by the relative movement between the roller and the conical surface, but the contact area between the roller and the conical surface is not large. Large, unable to bear heavy loads, so the expansion shaft can only be used in applications with lower loads

In addition, Chinese Patent Publication No. 200810041798.9 also discloses a mechanical expansion shaft mechanism, which achieves expansion by screw rotation. However, its driving method cannot accurately control the expansion force, and if the parts are processed incorrectly, it will lead to The expansion force is different on both sides of the expansion axis

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