Pre-Vulcanised Annular Crown Of Ultra-Large Tyre And Preparation Method Therefor And Application Thereof

Abstract

The present invention relates to a pre-vulcanized annular crown of an extra-large tire, and a preparation method and an application thereof. The annular crown includes shoulder extending edges, which extend from both sides of the crown to the central direction of the tire along shoulders, where the shoulder extending edges are provided with a structure of pattern blocks and pattern grooves, which extend from a tread to sidewalls and are suitable for the extra-large tire, and outer contour lines of sections of the shoulders and the shoulder extending edges are concave inwards. Pattern grooves in original shoulders can be completely removed when an old tire body is ground, and the crown structure and functional advantages of the extra-large tire which is retreaded can be fully given.

Claims

1.-13. (canceled)

14. A pre-vulcanized annular crown of an extra-large tire, wherein the extra-large tire is a pneumatic tire with a nominal diameter of 33 inches or more of a rim and a nominal width of 24 inches or more of a section, and the tire is designed that the outer diameter is 2,000 mm or more, and a single tire load is 2,000 kg or more; the extra-large tire comprises an annular crown, and shoulder extending edges extending from both sides of the crown to the central direction of the tire along shoulders, where the shoulder extending edges are provided with a structure of pattern blocks and pattern grooves, which extend from a tread to sidewalls and are suitable for the extra-large tire, outer contour lines of sections of the shoulders and the shoulder extending edges are concave inwards, the arc radius of the inner surfaces of the shoulder extending edges is 100-350 mm, the ends of the shoulder extending edges are blunt ends formed by a straight line or an arc, and the thickness of the blunt edges is 3-10 mm.

15. The annular crown according to claim 14, wherein the middle segment at the inner side of the section of the annular crown is a multi-segment arc, and the inner sides of the shoulder extending edges at both ends are arcs tangent to the middle segment, or the inner sides of the shoulder extending edges at both ends are straight line segments with a tangent arc transition to the middle segment.

16. The annular crown according to claim 14, wherein the width range of a traveling surface of the annular crown is more than 500 mm, the arc radius of the traveling surface of the annular crown is more than 2,000 mm, and the thickness of the annular crown is 100 mm-250 mm.

17. The annular crown according to claim 14, wherein the annular crown is provided with cooling grooves on the surface of the pattern blocks at the shoulders.

18. The annular crown according to claim 14, wherein multiple sensor installation blind holes are distributed on the surface of tread rubber of the annular crown, and the bottom ends of the blind holes are located between a primer and belts.

19. The annular crown according to claim 14, wherein the annular crown comprises tread rubber, the primer, and belts.

20. The annular crown according to claim 19, wherein the annular crown also comprises one or more of the following rubber layers: belt interlayer, belt primer, and shoulder pad.

21. The annular crown according to claim 19, wherein the maximum width of the belts is less than 90% of the width of the traveling surface, the number of layers of steel cords in the belts is 3-6, the acute angle formed by the steel wire of each layer of cords and the circumferential center line of the tire is 2°-35°, and the directions of the angles between the steel wires of two adjacent cord layers are opposite.

22. The annular crown according to claim 14, wherein the section height of the annular crown is 1.5-2.5 times the central thickness of the annular crown.

23. The annular crown according to claim 14, wherein the total width of the annular crown is 1.02-1.15 times the width of the traveling surface.

24. A method for preparing the pre-vulcanized annular crown of an extra-large tire according to claim 14, comprising the following steps: measuring a new crown structure of a tire to be retreaded to obtain the main size of the tire and the characteristic size of the crown; designing the structural components and dimensions required for the crown according to the obtained shape and size, planning the layout of the tread patterns and shoulder extending edge patterns, and designing and manufacturing a vulcanization mold with patterns; using molding equipment to build an annular crown structure, laying each layer of structural materials in sequence, and forming shoulder extending edges on both sides during the laying process; and by means of a vulcanization plant, preparing a pre-vulcanized annular crown with shoulder extending edges by using a patterned annular mold.

25. A retreaded extra-large tire, wherein the annular crown according to claim 14 is used as a structural component of the tire and is combined with the carcass of the old tire after stripping the tread and belts, and a retreaded tire is formed after vulcanization.

26. A new extra-large tire, wherein the annular crown according to claim 14 is used as a structural component of the tire and is combined with pre-prepared carcass structural components, and a new tire is formed after vulcanization, where the pre-prepared structural components are freshly prepared and vulcanized, and have all the other components necessary to constitute a tire except the crown structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG. 1 is a sectional view of the pre-vulcanized annular crown;

[0049] FIG. 2 is a schematic diagram of the side view appearance;

[0050] FIG. 3 is a sectional view of FIG. 1 after combining the carcass;

[0051] FIG. 4 is a schematic diagram of the side view appearance of FIG. 3;

[0052] FIG. 5 is the enlarged schematic diagram of the end of shoulder extending edges at I shown in FIG. 1,

[0053] FIG. 6 is a schematic diagram of the shoulder extending edges with the straight line segment;

[0054] FIG. 7 is a sectional view of FIG. 6 after combining the carcass;

[0055] FIG. 8 is a cross-sectional schematic view of existing pre-vulcanized tread;

[0056] FIG. 9 is a schematic diagram of rubber filling of retreaded tires produced in the prior art.

[0057] Symbols in the figures are listed as follows:

[0058] 1—belt primer, 2—shoulder pad, 3—belt, 4—base rubber, 5—tread rubber, 6—belt interlayer, 7—shoulder extending edge, 8—anti-scratch line, 9—carcass, 10—blind hole, 11—middle pad rubber, and 12—cooling groove.

[0059] Instructions for size marks in the figures:

[0060] B1—the width of the traveling surface of the pre-vulcanized annular tire;

[0061] B2—the total width of the pre-vulcanized annular crown;

[0062] H1—the thickness of pre-vulcanized annular crown;

[0063] H2—section height of pre-vulcanized annular crown;

[0064] R1—the radian of the inner section body of the pre-vulcanized annular crown;

[0065] R2—the arc segment of the inner surface of the shoulder extending edges on the pre-vulcanized annular tread.

DETAILED DESCRIPTION

[0066] In order to better understand the present invention, the following will further explain the present invention.

Embodiment 1

[0067] This embodiment relates to a pre-vulcanized annular crown of a 59/80R63 extra-large tire, where the middle segment at the inner side of the section of the annular crown is a multi-segment arc, and the inner sides of the shoulder extending edges at both ends are arcs tangent to the middle segment.

[0068] 1. After the tire is used, its size and structure are quite different from a new one. Therefore, before retreading the tire, it is necessary to inspect the main body size and crown structure size of the corresponding new tire, so as to determine the structural dimensions of the pre-vulcanized annular crown.

[0069] Parameters of a new tire are as follows:

[0070] The tire section width is 1,490 mm, the outer diameter is 4,025 mm, the width of a traveling surface is 1,300 mm, the arc radius of the traveling surface is 3,900 mm, and the pattern depth is 88 mm.

[0071] The basic size of the annular crown is the same as that of a new tire, and the other main characteristic dimensions of the annular crown are determined as follows:

[0072] Crown thickness H1 is equal to 160 mm, total height of the annular crown section H2 is equal to 350 mm, total width of the annular crown section is 1430 mm, and radius of the inner arc surface of the shoulder extending edges 7 is 350 mm.

[0073] According to the above size data, a pre-vulcanized annular crown of an extra-large tire is realized as follows:

[0074] As shown in FIG. 1, the pre-vulcanized annular crown includes an annular crown and shoulder extending edges 7 on both sides of the crown, and the tread included in the crown has tread patterns suitable for extra-large tires.

[0075] The annular crown can include the common structure of the general new crown in the current prior art, namely tread rubber 5, base rubber 4, belts 3, belt interlayer 6, shoulder pad 2 and belt primer 1. The middle part of the innermost side (near the carcass side) is the belt primer 1, both sides of which are shoulder pad rubber 2, and the top of the belt primer 1 is the belts 3, the base rubber 4 and the tread rubber 5 in sequence, where two ends of the base rubber 4 are connected to two ends of the shoulder pad 2, and the belt interlayer 6 is provided there-between, and both sides of the tread rubber 5 have shoulder pattern extending edges 7 extending downward to cover the ends of the base rubber 4 and the shoulder pad 2.

[0076] As shown in FIG. 1 and FIG. 2, the shoulder extending edges 7 have a structure of pattern block sand pattern grooves extending from a tread to sidewalls, where the convex parts are pattern blocks, and the concave parts are pattern grooves. The annular crown is provided with cooling grooves 12 on the side of the pattern blocks at the shoulders.

[0077] As shown in FIG. 1 and FIG. 3, the section of the inner surface of the annular crown is a curve composed of multiple tangent arcs, which can better fit the old carcass after grinding. The radius of the inner arc surfaces of the shoulder extending edges 7 is 350 mm, and a larger radius of the inner arc surface can improve the matching degree between the tread and the carcass. The ends of the shoulder extending edges 7 are ends of straight line blunt edges, and as shown in FIG. 5, the average thickness of the blunt edges is 6 mm, which can improve the material strength at the edges of the tread.

[0078] The width of the traveling surface of the annular crown is 1,300 mm, the radius of the arc of the traveling surface of the annular crown is 3,900 mm, and the thickness of the annular crown is 160 mm. The parameters related to the size of the tire outer edge must be consistent with the size of the new tire to match tires of the same specification.

[0079] There are six layers of the belts 3 in total, and the width of the widest layer is 1,100 mm. Starting from the innermost layer 1, the angle of the first layer is 5°, the angle of the steel wires of the second to fourth layers of belts is 20°, the angle of the steel wires of the belts of the 5th to 6th layers is 25°, and the directions of the angles between the steel wires of the two adjacent cord layers are opposite.

[0080] 2. An outer tread mold with pattern grooves is used, and the preparation is completed after being vulcanized by the vulcanization device suitable for the present invention.

[0081] 3. Realization of tire retreading: after removing the tread and belts from the carcass to be retreaded, pretreatments such as grinding, repairing and glue spraying are performed on the outer surface according to the size combined with the pre-vulcanized annular tread, the pre-vulcanized annular crown of this embodiment is assembled, and secondary vulcanization of the crown is performed in a suitable retreaded tire vulcanization plant.

[0082] The service life of the extra-large tire retreaded by this embodiment can reach 80%-100% of the original tire.

Embodiment 2

[0083] This embodiment relates to a pre-vulcanized annular crown of a 59/80R63 extra-large tire, where the middle segment at the inner side of the section of the annular crown is a multi-segment arc, and the inner sides of the shoulder extending edges at both ends are arcs tangent to the middle segment.

[0084] The same parts of the new tire parameters and the main characteristic dimensions of the annular crown are referred to in embodiment 1. The difference is that the inner side of the shoulder extending edges 7 is a straight line segment tangent to the arc, with the angle between the straight line segment and the center line of the section being 35°, and the radius of the transition arc between the straight line segment and the inner surface of the crown being 100 mm.

[0085] According to the above size data, a pre-vulcanized annular crown for an extra-large tire is realized as follows:

[0086] As shown in FIG. 6, the pre-vulcanized annular rubber crown includes an annular crown and shoulder extending edges 7 on both sides of the crown. The shoulder extending edges extend along the shoulders toward the center of the tire, and the tread included in the crown are provided with tread patterns suitable for extra-large tires.

[0087] Similar to embodiment 1, the annular crown includes a tread rubber 5, a base rubber 4, belts 3, a belt interlayer 6, a shoulder pad 2, and a belt primer 1, which are arranged in order from outside to inside.

[0088] As shown in FIGS. 6 and 7, the shoulder extending edges 7 are provided with a structure of pattern blocks and pattern grooves, which extend from a tread to sidewalls. The annular crown is provided with cooling grooves 12 on the sides of the pattern blocks at the shoulders.

[0089] As shown in FIGS. 6 and 7, the middle segment of the inner surface section of the annular crown is a curve composed of multiple tangent arcs, which can better fit the old carcass after grinding. The inner side of the shoulder extending edges 7 is a straight line segment tangent to the arc, the angle between the straight line segment and the section center line is 30-35°, and the radius of the transition arc of the straight line segment and the inner surface of the crown is 100 mm. The ends of the shoulder extending edges 7 are ends of straight blunt edges, as shown in FIG. 5, the thickness of the blunt edges is 6 mm, which can improve the material strength at the edge of the tread, avoid the damage of the annular tread during the turnover, and increase bonding area after the carcass is vulcanized for the second time. The width of the traveling surface of the annular crown is 1,300 mm, the radius of the arc of the traveling surface of the annular crown is 3,900 mm, and the thickness of the annular crown is 160 mm. The parameters related to the size of the outer edge of the tire must be consistent with the size of a new tire to match tires of the same specification.

[0090] There are six layers of the belts 3 in total, and the width of the widest layer is 1,100 mm. Starting from the innermost layer 1, the angle of the first layer is 5°, the angle of the steel wires of the second to fourth layers of belts is 20°, the angle of the steel wires of the belts of the 5th to 6th layers is 25°, and the directions of the angles between the steel wires of the two adjacent cord layers are opposite.

Embodiment 3

[0091] The difference between this embodiment and embodiment 1 is that sensor installation blind holes 10 are distributed on the surface of the tread rubber, and the bottom ends of the blind holes 10 are located between the base rubber and the belts.

[0092] Preset sensor installation blind holes are added in the tread. When it is necessary to install a tread sensor to monitor the use of extra-large retreaded tires, the sensor can be installed directly without drilling holes on the tread, which can improve the accuracy of the sensor installation position and work efficiency in the later stage. The blind holes on the tread correspond to the raised cylindrical structure on the vulcanization mold. The cylindrical structure is in the pattern blocks during vulcanization, which increases heat transfer points inside the tread rubber, can improve the distribution state of the heat in the tread during vulcanization, is beneficial to the vulcanization uniformity of the pattern block rubber, improves the vulcanization quality, and reduces the vulcanization time. By setting up the sensor installation blind holes, it is convenient to use monitoring technology on an extra-large retreaded tire, which can give early warning of early failures that may occur in a certain position of the tire, timely maintenance to avoid greater risk of failure, improve the service life and security of the extra-large retreaded tire, and increase the added value of the retreaded tire.

[0093] The above description is only preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto, any changes that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be subject to by the scope of protection of the claims.