Mechanical-drum turn-up tire building mechanism

Abstract

The invention relates to a mechanical-drum turn-up tire building mechanism. The tire building machine comprises a guide disk, a sector block and a turn-up roller wheel, wherein the guide disk is arranged on a shaft sleeve and is opposite to a cylinder body; the sector block is arranged between the cylinder body and the guide disk; and the turn-up roller wheel is supported on the arc surface of the guide disk. The tire building machine is characterized in that: the guide disk is composed of a guide disk matrix and a guide disk separating body, wherein, the guide disk separating body is uniformly and movably embedded in the guide disk matrix along the circumference, and is fixedly arranged on the side face of the sector block by a fastening piece; and the turn-up roller wheel is arranged on the arc surface of the guide disk separating body. With the structure, when the sector block locks a steel wire ring of the tire body along the radial direction, the guide disk separating body and the roller wheel arranged on the arc surface of the guide disk separating body are driven to move at the same time so that the supporting height of the turn-up endpoints of the tire body is lowered, the turn-up roller wheel starts to press the tire body from the root part so as to reduce stockpiles on the tire side; and in addition, the guide disk separating body is matched with the guide disk matrix so as to ensure bidirectional guide of the sector block in the whole running process and improve the movement stability and reliability of the sector block.

Description

technical field [0001] The invention relates to tire building equipment, in particular to a mechanical drum type tire turn-up forming mechanism. Background technique [0002] The mechanical drum or capsule drum is the key structure in the tire building equipment to realize the locking of the carcass bead and the sidewall turnup. At present, the common mechanical drum includes a central shaft, a sidewall turnup mechanism symmetrically arranged at both ends of the central shaft and a symmetrical The traveler locking mechanism is located in the middle of the central shaft, and the sidewall turn-up mechanism is composed of a pneumatic turn-up drive structure, a turn-up rod connected to the turn-up drive structure, and a turn-up roller installed at the end of the turn-up rod ;The traveler locking mechanism is composed of a shaft sleeve set on the central shaft, a cylinder block and a guide disc installed on the shaft sleeve, and a piston and a sector block arranged between the gu...

AI Technical Summary

Problems solved by technology

The forming efficiency of the above-mentioned mechanical drum is high, but because the end point of the carcass turn-up is too high, the turn-up roller cannot press the sidewall from the root when pressing, and it is easy to pile up materials. In addition, when the above-mentioned sector blocks move radially It is unilaterally guided, and its movement stability and reliability are poor

In order to reduce the sidewall piling and improve the stability and reliability of the movement of the sector, some tire manufacturers have made some improvements in the contact between the sector and the guide disc. Uniformly distributed bumps with rising arc surfaces are integrally arranged on the contacting end faces, and the guide plate adopts a straight sleeve structure, and a positioning groove corresponding to the part of the bump close to the central axis is set on the outer circular surface of the guide plate, and the above structure improves Sidewall stacking and sector block guidance are realized, but the guiding distance of the sector block on one side of the guide plate is relatively short. When the bump breaks away from the positioning groove of the guide plate and the sector block continues to move outward, it is still unilaterally guided. The stability and reliability of the movement need to be further improved

In addition, the turn-up rollers used in the mechanical drum are made of nylon. During the turn-up process, too deep indentations are formed on the sidewall, which reduces the molding quality of the product.

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