Giant engineering tire forming drum

Abstract

The invention relates to a giant engineering tire forming drum which comprises wide drum tiles, narrow drum tiles, a drum tile expansion and contraction mechanism and a narrow drum shoulder contraction mechanism, wherein a narrow drum tile expansion and contraction mechanism is suspended on the inner sides of the narrow drum tiles, and is used for guiding narrow drum shoulders to be expanded and contracted in a direction forming a certain included angle with the axis of the forming drum; the narrow drum shoulders of every two adjacent narrow drum tiles have different amounts of contraction, and are arranged in different layers in a superimposed state; the drum tile expansion and contraction mechanism forms a triangular support to the wide and narrow drum tiles in an unfolded state. According to the giant engineering tire forming drum, the narrow drum shoulder contraction mechanism is contracted in the vicinity of a main connecting rod and an auxiliary connecting rod when being folded, so that a folding space can be fully utilized, and high folding ratio is ensured; the narrow drum shoulders are arranged in different layers in a folded state, and the phenomenon of lateral cutting of the narrow shoulder drums is avoided; the narrow drum shoulders are contracted towards the center of the forming drum along a guide rail forming a certain included angle with the axis of the forming drum, so that the phenomenon of tangent tire blank squeezing caused by the axial contraction of the drum shoulders is avoided, and the forming quality of a giant engineering tire is improved; the drum tile expansion mechanism forms the triangular support in an unfolded state, so that the rigidity of the forming drum is improved.

Description

technical field [0001] The invention belongs to the field of material molding, and in particular relates to a giant engineering tire molding drum. Background technique [0002] At present, the OTR tire building drum is mainly a connecting rod type mechanical folding building drum, which is composed of a wide drum tile, a narrow drum tile, and a drum tile expansion and contraction mechanism. The drum tile expansion and contraction mechanism includes: a main core body of the building drum matched with the interface of the brake sleeve of the OTR tire building machine, a secondary core body of the building drum connected to the main shaft of the forming machine with a flat key that rotates relative to the main core body of the forming drum, and suspended on the The wide drum tile expansion and contraction mechanism and the narrow drum tile expansion and contraction mechanism between the two. When the molding machine completes the molding of a tire blank, brake the brake sleeve...

AI Technical Summary

Problems solved by technology

[0007] Judging from the existing patented technology of shoulder-shrinking tire building drums, the common defect is that the axial movement of the auxiliary core of the forming drum is relatively large, which limits the shrinkage space of the drum shoulder and cannot meet the super large folding ratio (≥1.45 ) The molding process requirements of giant OTR tires; the shrinking drum shoulders are arranged in the same layer, and the side body interference part of the narrow drum shoulders needs to be cut off, which will affect the smoothness of the molding roller movement and damage the tire molding quality; especially, because the drum shoulders adopt shaft In the horizontal expansion and contraction mode, both the wide drum tile and the narrow drum tile need to be equipped with a cover plate to cover the telescopic gap and make the pressure roller move smoothly. However, when the drum shoulder shrinks axially, the gap between the shrinking drum shoulder and the cover The relative movement of the tire will cause severe tangential extrusion on the tire blank at the edge of the cover plate, destroying the uniformity of the axial distribution of the cord and reducing the molding quality of the tire

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