Tyre moulding drum

Abstract

The invention provides a tyre moulding drum. The tyre moulding drum comprises two semi-drum devices used for sleeving a main shaft; each semi-drum device comprises a reverse coating unit, a guiding body, and a guiding disk; each reverse coating unit comprises a plurality of reverse coating rods and a rolling unit connected with the reverse coating rods through pivotal connection; each guiding bodyis used for guiding and accommodating the reverse coating rods; each rolling unit is designed to be cooperative with the external peripheral arc-shaped surface of the corresponding guiding disk; whenthe plurality of reverse coating rods are at initial positions, a corresponding rolling unit is driven to swing inward, and is stored at the radial inner side of a corresponding guiding body; the radial height of a first periphery surface formed at the outermost radial side of the rolling units is lower than that of a second periphery surface formed by the external surface of the guiding body, and that of a third periphery surface formed by the supporting surfaces of the reverse coating rods; the height of the second periphery surface is equal to the height of the third periphery surface; thereverse coating rods and the guiding bodies are combined so as to form basically sealed flat cylindrical surfaces used for receiving tyres; and at the same time, in reverse coating, the rolling unitsare driven to swing outward, and are higher than the reverse coating rods, so that tyre parts are jacked along the radial direction, and the friction between tyre parts and the reverse coating rods and the guiding body is reduced.

Description

technical field [0001] The invention relates to the technical field of tire building equipment, in particular to a tire building drum. Background technique [0002] During the tire blank building process, when tire components (such as PA composite layer, carcass ply) are attached to the tire building drum, a flat cylindrical surface is required as the attachment surface. Such as figure 1 As shown, each half-drum device 2' of the existing tire building drum 100' is provided with a turn-up unit 22' composed of a plurality of turn-up bars 221' uniformly distributed along the circumferential direction. Wherein, each turn-up rod 221' is provided with a radially outward supporting surface. When the plurality of turn-up rods 221' are in the starting position, the supporting surfaces of the plurality of turn-up rods 221' can form an unenclosed circumferential surface for receiving and supporting tire components. [0003] In order to form an approximately closed circumferential su...

AI Technical Summary

Problems solved by technology

[0006] 1. If the joint happens to be located at the above groove n', it will seriously affect the suture effect of the joint;

[0007] 2. Due to the stickiness of the tire components, the tire components sunken in the above-mentioned groove n' further increase the friction between the circumferential surface of the tire building drum, which will cause unexpected and unpredictable deformation of the tire components during the turn-up process. Tensile deformation, which greatly affects the build quality of tire carcass components

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