All-steel light truck fan-shaped block capsule of three-drum forming machine

Abstract

The utility model belongs to the field of tire manufacturing, and particularly relates to an all-steel light truck fan-shaped block capsule of a three-drum forming machine, one side of a capsule body is a capsule outer edge, the other side corresponding to the capsule outer edge is a capsule inner edge, and a part between the inner edge and the outer edge of the capsule body and contacted with a forming drum fan-shaped block is a capsule bottom. A capsule top is arranged between the inner and outer edges of the capsule body and corresponds to the capsule bottom, a capsule tail is arranged between the capsule top and the capsule outer edge, and the capsule top has a capsule gradient a; the gradient a of the capsule is 10 degrees; the top gradient of the capsule is reduced, the effective positioning width of the steel ring is increased, and the steel ring is prevented from falling outside.

Description

Technical Field

[0001] This utility model belongs to the field of tire manufacturing, specifically relating to a three-drum forming machine for an all-steel light truck fan-shaped block capsule. Background Technology

[0002] Currently, the main tire forming machines used in China for producing all-steel light truck radial tires are three-drum forming machines, which are widely used due to their low maintenance costs and high production efficiency. Three-drum forming machines produce a variety of specifications, including 16-inch and 17.5-inch sizes. The 16-inch size produces 7.50R16 and 8.25R16 tires. During the on-site production of 7.50R16 tires, problems such as bead protrusion and bead pull-up often occur. Adjustments are frequently made through structural modifications, but these adjustments result in a full-circle indentation in the tire bead, leading to insufficient bead rubber after vulcanization, severely affecting the quality of the finished tire. A comparison of bead shapes produced by different machine models reveals that tires produced by two-drum light truck forming machines have fuller beads, while those produced by three-drum forming machines have significantly narrower beads. Structural analysis of the forming machines shows that the sector block structures are identical. Analysis of the bladder curve reveals that the bottom curve and angle of the 16-inch bladder produced by the three-drum forming machine are unreasonable. Utility Model Content

[0003] The purpose of this invention is to provide a novel sector-shaped bladder for all-steel light truck radial tires. Using this bladder can effectively solve the problems of bead dents and insufficient rubber on the tire bead after vulcanization in the 7.50R16 specification during the production process, thereby improving the quality of the finished tire.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A novel all-steel light truck radial tire sector block capsule includes a capsule body, one side of which is the outer edge of the capsule, and the other side corresponding to the outer edge of the capsule is the inner edge of the capsule. The part between the inner and outer edges of the capsule body and in contact with the formed drum sector block is the bottom of the capsule. The part between the inner and outer edges of the capsule body and corresponding to the bottom of the capsule is the top of the capsule. A tail of the capsule is provided between the top of the capsule and the outer edge of the capsule. The top of the capsule has a capsule slope a; the capsule slope a is 10°.

[0006] The part of the capsule that contacts the outer edge is the top curvature, which is R5.

[0007] The top and bottom of the capsule are connected by a smooth arc.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] 1. The slope of the capsule top is reduced to increase the effective landing width of the steel ring and prevent the steel ring from landing too far outward.

[0010] 2. The curvature of the capsule top is close to the angle of the outer edge of the hexagonal steel ring, so that the steel ring fits the capsule tightly.

[0011] 3. The tail of the capsule is curved to ensure that the steel ring sits completely on the bottom of the capsule. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the capsule and steel ring of this utility model.

[0013] Figure 2 This is a diagram showing the usage state of the capsule of this utility model.

[0014] Figure 3 This is a schematic diagram of the original capsule and the steel ring (1).

[0015] Figure 4 This is a schematic diagram of the original capsule and the steel ring (2).

[0016] Wherein, 1 is the capsule body; 11 is the outer edge of the capsule; 12 is the inner edge of the capsule; 13 is the top of the capsule; 131 is the top curvature; 14 is the bottom of the capsule; 15 is the tail of the capsule; 2 is the fan-shaped block of the forming drum; 3 is the steel ring; 4 is the forming drum reverse wrapping pressure roller. Detailed Implementation

[0017] This utility model provides a novel sector-shaped block capsule for an all-steel light truck radial tire. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] like Figure 1 As shown, a novel all-steel light truck radial tire sector block capsule includes a capsule body 1, which sits above a forming drum sector block 2. One side of the capsule body 1 is the capsule outer edge 11, which is the side closest to the forming drum reverse pressure roller 4. The other side corresponding to the capsule outer edge 11 is the capsule inner edge 12. The part between the inner and outer edges of the capsule body 1 and in contact with the forming drum sector block 2 is the capsule bottom 14. The part between the inner and outer edges of the capsule body 1 and corresponding to the capsule bottom 14 is the capsule top 13. A capsule tail 15 is provided between the capsule top 13 and the capsule outer edge 11. The part of the capsule top 13 in contact with the outer edge is the top arc 131. The capsule top 13 is provided with a capsule slope a.

[0019] To increase the effective seating width of the steel ring, such as Figure 2-4 As shown, the bottom slope of the original capsule was optimized:

[0020] The capsule slope 'a' is reduced from 24° to 10°. By reducing the bottom slope 'a' of the capsule, the steel rim can fall completely to the bottom when the fan-shaped block rises. At the same time, reducing the bottom slope 'a' of the capsule can also effectively prevent the steel rim from slipping outward when the fan-shaped block rises, and reduce the deformation of the steel rim caused by an excessive bottom slope 'a' of the capsule. In addition, by reducing the capsule slope 'a' from 24° to 10°, the width W1 of the top 13 of the capsule is increased from 19 mm to 26 mm. This effectively increases the width of the steel rim sitting on the top 13 of the capsule, allowing the steel rim to fall completely on the top of the capsule. When the fan-shaped block rises, it no longer squeezes the steel rim rubber, thereby eliminating the pit around the tire bead.

[0021] The top curvature 131 is reduced from the original R14 to R5, so that the top of the capsule 13 fits tightly with the outer edge of the steel ring, eliminating air bubbles inside the steel ring.

[0022] To reduce slippage of the steel rim and ensure that it sits completely on the top 13 of the bladder, the connection between the top 13 and the tail 15 of the bladder has been optimized from a straight transition to a smooth arc transition. This completely avoids the problem of the tire bead being dented around the rim when the fan-shaped block rises, which would otherwise be caused by the compression of the rubber material on the outside of the steel rim. It also prevents the finished tire from having insufficient rubber on the bead.

[0023] This utility model provides a three-drum forming machine for all-steel light trucks with a fan-shaped block capsule. By redesigning the capsule's top slope and curvature, the actual width of the steel ring is increased, preventing the steel ring from landing too far out and ensuring a tight fit between the steel ring and the capsule. The connection between the top and bottom of the capsule is optimized from a straight line to a smooth arc, allowing the steel ring to sit completely at the bottom of the capsule. This effectively avoids problems such as narrowing of the bead opening, pitting around the tire blank, and missing bead glue in the finished tire caused by the fan-shaped block squeezing.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A three-drum forming machine all-steel light truck fan-shaped block capsule, comprising a capsule body, characterized in that, One side of the capsule body is the outer edge of the capsule, and the other side corresponding to the outer edge of the capsule is the inner edge of the capsule. The part between the inner and outer edges of the capsule body and in contact with the molded drum-shaped block is the bottom of the capsule. The part between the inner and outer edges of the capsule body and corresponding to the bottom of the capsule is the top of the capsule. The capsule tail is set between the top of the capsule and the outer edge of the capsule. The top of the capsule has a capsule slope a; the capsule slope a is 10°.

2. The all-steel light-duty fan-shaped block capsule of a three-drum forming machine as described in claim 1, characterized in that, The part of the capsule that contacts the outer edge is the top curvature, which is R5.

3. The all-steel light-duty fan-shaped block capsule of a three-drum forming machine as described in claim 2, characterized in that, The top and bottom of the capsule are connected by a smooth arc.

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