CN-121989595-A - Side bulge preventing structure of all-steel agricultural radial tire and preparation process thereof

CN121989595ACN 121989595 ACN121989595 ACN 121989595ACN-121989595-A

Abstract

The invention relates to the technical field of tire manufacturing, and discloses an all-steel agricultural radial tire sidewall bulge preventing structure and a preparation process thereof. The tire sidewall bulge preventing structure comprises a tire sidewall area, wherein an inner liner, an irradiation tire body reinforcing film and tire body cord fabrics are sequentially arranged from the inner side to the outer side, and the preparation process comprises the following steps of S1, preparing a rubber composition film, S2, preparing an irradiation tire body reinforcing film, S3, accurately attaching the irradiation tire body reinforcing film to a designated position on the outer surface of the inner liner, S4, attaching the tire body cord fabrics on the outer side of the irradiation tire body reinforcing film, and S5, integrally forming, shaping and vulcanizing the tire. By adopting the technical scheme of high-energy electron beam irradiation pre-vulcanization treatment for reinforcing the rubber sheet and accurate positioning and fitting, the problems of providing rigid support for the tire body curtain cloth, homogenizing stress distribution, eliminating local bulge of the tire side and easily generating periodical bulge and depression from the pattern groove to the tire side under inflation and load are achieved.

Inventors

DONG WENXIAO
LI XIAOHU
CHEN XIANSONG
TIAN HUIJUN
CHENG CHAO

Assignees

贵州轮胎股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260324

Claims (10)

1. The tire sidewall bulge preventing structure of the all-steel agricultural radial tire is characterized by comprising an inner liner, an irradiation tire body reinforcing film and tire body cord fabrics which are sequentially arranged in a tire sidewall area from inside to outside; The irradiation carcass reinforcing film is paved at a position below the tire sidewall corresponding to the tread pattern groove and covers a projection area of the tread pattern groove on the inner surface of the tire sidewall; the irradiation matrix reinforced film is a rubber composition film which is subjected to high-energy electron beam irradiation pre-vulcanization treatment, and the inside polymer molecules of the rubber composition film form a partially crosslinked pre-vulcanization structure after the irradiation pre-vulcanization treatment.
2. The sidewall bulge preventing structure of the all-steel agricultural radial tire according to claim 1, wherein the irradiation carcass reinforcing film is tightly attached to the outer surface of the inner liner layer, and the plane width of the irradiation carcass reinforcing film is slightly wider than the bottom width of the corresponding tread pattern groove.
3. The all-steel agricultural radial tire sidewall bulge preventing structure according to claim 1, wherein the carcass ply is a ply structure consisting of rubber covered cords, and the carcass ply adopts an increased radial expansion rate.
4. An all-steel agricultural radial tire sidewall bulge preventing structure according to claim 1, wherein the laying range of the irradiation carcass reinforcing film only covers the critical area below the corresponding tread pattern groove of the tire sidewall and does not extend to other non-critical areas of the tire sidewall.
5. The preparation process of the sidewall bulge preventing structure of the all-steel agricultural radial tire is characterized by comprising the following steps of: S1, preparing a rubber composition film, namely selecting rubber composition raw materials for mixing and calendaring to prepare the rubber composition film with a preset size, wherein the preset size is matched with a paving area below a tread pattern groove corresponding to a tire sidewall; s2, performing high-energy electron beam irradiation pre-vulcanization treatment on the rubber composition film to obtain an irradiation matrix reinforced film; s3, precisely attaching the irradiation matrix reinforcing film to the appointed position of the outer surface of the inner liner; S4, attaching a tire body cord fabric to the outer side of the irradiation tire body reinforcing film to finish structural molding of the tire sidewall; s5, performing overall tire forming, shaping and vulcanization to obtain the finished product of the all-steel agricultural radial tire.
6. The process according to claim 5, wherein in step S2, the high-energy electron beam irradiation pre-vulcanization is performed by an electromagnetic irradiation device, and the irradiation process causes a moderate crosslinking reaction of polymer molecules inside the rubber composition film to form a partially pre-vulcanized structure.
7. The manufacturing process according to claim 5, wherein in the step S3, the specified position is an area of the outer surface of the liner layer corresponding to the lower portion of the tread pattern groove of the tire, the irradiation carcass reinforcing film completely covers the projection area of the tread pattern groove on the inner surface of the sidewall during the fitting process, and the fitting is wrinkle-free and offset-free.
8. The process according to claim 5, wherein in step S4, the radial expansion rate of the carcass ply is controlled before the carcass ply is attached, after the carcass ply reaches the preset radial expansion rate, the carcass ply is attached to the outer surface of the irradiated carcass reinforcing film tightly, and the carcass ply and the irradiated carcass reinforcing film are in contact without gaps.
9. The manufacturing process according to claim 5, wherein in step S5, the tire is integrally formed following the conventional forming process of the all-steel agricultural radial tire, and the process parameters of shaping and vulcanizing are consistent with the vulcanization parameters of the conventional all-steel agricultural radial tire of the same specification.
10. The manufacturing process according to claim 5, wherein in the step S1, the preset size of the rubber composition film is determined according to the size of the corresponding tread pattern groove and the size of the sidewall laying area, and the thickness of the film is adapted to the structural design of the tire sidewall.

Description

Side bulge preventing structure of all-steel agricultural radial tire and preparation process thereof Technical Field The invention relates to the technical field of tire manufacturing, in particular to an all-steel agricultural radial tire sidewall bulge preventing structure and a preparation process thereof. Background The all-steel agricultural radial tire is used as a core matching component of agricultural machinery, is generally designed to adapt to the complex field operation environment by adopting a wide-base, high-bearing and large-pattern depth structure, and is widely applied to large and medium-sized tractors, combine harvesters and other equipment by arranging wide and deep pattern grooves on the tread to improve the ground grabbing, mud discharging and passing performances. The tire adopts the carcass ply to bear main load, adopts the inner liner to ensure airtight performance, and directly determines the bearing capacity and the use safety of the tire. In the production and use process of the existing all-steel agricultural radial tire, during vulcanization of the tire, rubber flows to the blocks at two sides under the extrusion of a mold pattern groove, and the difference of the thin degree of the curtain cloth at the block and the groove is caused due to the inconsistent stress at the block and the groove, so that periodic bulge and depression easily occur from the groove to the sidewall position under inflation and load of the tire, and further the problems of local interval increase and distribution disorder of tire body cords are caused; In the industry, the method is generally improved by adopting modes of optimizing a rubber material formula, adjusting vulcanization parameters or improving forming equipment, but the method can only relieve surface defects, can not block abnormal migration of rubber materials from a structural layer, is difficult to radically eliminate the condition of disordered cord arrangement, leads to easy stress concentration of the tire after inflation and use, and seriously influences the structural stability and the use reliability of the tire. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an all-steel agricultural radial tire sidewall bulge preventing structure and a preparation process thereof, which solve the problem that the tire is easy to bulge and dent periodically from a pattern groove to a sidewall position under inflation and load due to the fact that the thin and dense degree of curtain cloth at the block and the groove is different. The invention is realized by the following technical scheme that the tire sidewall bulge preventing structure of the all-steel agricultural radial tire comprises an inner liner, an irradiation tire body reinforcing film and tire body cord fabrics which are sequentially arranged in a tire sidewall area from inside to outside; The irradiation carcass reinforcing film is paved at a position below the tire sidewall corresponding to the tread pattern groove and covers a projection area of the tread pattern groove on the inner surface of the tire sidewall; the irradiation matrix reinforced film is a rubber composition film which is subjected to high-energy electron beam irradiation pre-vulcanization treatment, and the inside polymer molecules of the rubber composition film form a partially crosslinked pre-vulcanization structure after the irradiation pre-vulcanization treatment. Preferably, the irradiation carcass reinforcing film is tightly attached to the outer surface of the inner liner layer, and the plane width of the irradiation carcass reinforcing film is slightly wider than the bottom width of the corresponding tread pattern groove. Preferably, the carcass ply is a ply structure comprising rubberized cords, and the carcass ply adopts an increased radial elongation. Preferably, the laying range of the irradiation carcass reinforcing film only covers the critical area below the corresponding tread pattern groove of the tire sidewall and does not extend to other non-critical areas of the tire sidewall. A preparation process of an all-steel agricultural radial tire sidewall bulge preventing structure comprises the following steps: S1, preparing a rubber composition film, namely selecting rubber composition raw materials for mixing and calendaring to prepare the rubber composition film with a preset size, wherein the preset size is matched with a paving area below a tread pattern groove corresponding to a tire sidewall; s2, performing high-energy electron beam irradiation pre-vulcanization treatment on the rubber composition film to obtain an irradiation matrix reinforced film; s3, precisely attaching the irradiation matrix reinforcing film to the appointed position of the outer surface of the inner liner; S4, attaching a tire body cord fabric to the outer side of the irradiation tire body reinforcing film to finish structural molding of the tire sidewall; s5, performing overall tir