Convex-key-type air expansion shaft with good non-skid property

Abstract

The invention relates to the technical field of air expansion shaft equipment, and discloses a convex-key-type air expansion shaft with a good non-skid property. The convex-key-type air expansion shaft comprises a shell; an air valve is fixedly connected to one end of the shell; a ventilation connector is fixedly connected to one side of the air valve; a central shaft is fixedly arranged in an inner cavity of the shell; through arrangement of supporting devices, air entering air bags supports and expands the air bags, and meanwhile convex keys and supporting plates are driven to perform supporting and fastening externally; inside air ejects limiting blocks while ejecting rectangular rods; when the air expansion shaft reaches a supporting spot, supporting panels are clamped above helical gears; limiting blocks can exert supporting and seizing effects on the supporting panels, so that deflecting of the supporting panels is avoided; a secondary supporting effect can be exerted on the convex keys; concaveness of the air bags is avoided; deflection between central positions of the air expansion shaft body and a sleeve pipe is avoided, so that the problems that when the sleeve pipe is used for winding a material, rotation of the sleeve pipe is not smooth and great noise is generated by eccentric rotation are solved; and meanwhile, the problem of sleeve barrel skidding is solved.

Description

technical field [0001] The invention relates to the technical field of inflatable shaft equipment, in particular to a convex key type inflatable shaft with good anti-skid performance. Background technique [0002] The inflatable shaft is a special rewinding and unwinding shaft, that is, the shaft whose surface can protrude after high-pressure inflation, and the shaft whose surface part retracts quickly after deflation is called the inflatable shaft. The inflatable shaft is divided into key type Expansion shaft, plate type air shaft, dot air shaft, etc. Among them, the main body of the convex key type air shaft is made of high-quality steel pipe, the surface is chrome-plated, the aluminum convex key is flexible, and it is equipped with high-quality rubber liner and quick inflation and exhaust. Nozzle, good sealing effect, long service life, detachable shaft head, easy maintenance, because the convex key type inflatable shaft expands a single key bar, the fulcrum spreads to ea...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional convex key type inflatable shaft still has the following problems in the actual use process: first, when acting in the casing, because the convex key type inflatable shaft is pushed out by the expansion of the airbag, the convex key will play a role in the casing. As a fixed support, the airbag is an expandable and contractable material. When the convex key is pressed down by the sleeve, the upper part of the airbag that is in contact with the convex key will inevitably be sunken, often causing the inflatable shaft body and the sleeve The deviation of the center position between the tubes, that is, the non-uniformity of the concentricity, causes problems such as unsmooth rotation of the sleeve and large noise caused by rotation when the sleeve is winding the material; secondly, when the sleeve is winding the material, it often provides better The large pulling force will straighten the material, which can make both sides of the wound material even and ensure the winding quality. However, the airbag itself is elastic, and it is difficult to provide sufficient and stable extrusion force for the convex key, causing the sleeve to expand relative to the air. The shaft slips, which will affect the material efficiency of the casing at the slightest, and cause the casing to be unwound and need to be rewound at the worst.

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