Green tire ovality correcting device

Abstract

The utility model provides a tire blank ovality correcting device which comprises an annular base, the annular base is suitable for being installed on a tire blank storage rack in front of a vulcanizing machine, and the annular base forms a sliding rail in the radial direction of the annular base; the at least two supporting blocks are movably arranged on the annular base in the radial direction of the sliding rail, the at least two supporting blocks integrally form an annular supporting ring, and the outer ring of the annular supporting ring is suitable for supporting a tire blank seam allowance; the driving mechanism drives the at least two supporting blocks to move in the radial direction at the same time or independently, and the driving mechanism drives the supporting blocks to have a correction state and a non-working state. The driving mechanism drives the at least two supporting blocks to move outwards in the radial direction to abut against the interior of the tire blank seam allowance so that the tire blank seam allowance can be adjusted from an oval shape to a perfect circle.

Description

Technical Field

[0001] The utility model belongs to the field of tires, and particularly relates to a device for correcting the ovality of a tire blank. Background Art

[0002] Vulcanization can enable rubber molecules to form a three-dimensional network structure, enhancing its strength and wear resistance, so that the tire can withstand greater pressure and wear during driving. The vulcanized rubber has better elasticity and flexibility, which is crucial for the performance of the tire under various road conditions. The performance of vulcanized rubber is more stable under high and low temperature environments and is not easily deformed, which helps to extend the service life of the tire. Before vulcanization, the tire blank is stored on a tire blank trolley. On the trolley, the tire blank may be subjected to uneven pressure due to different support points. This uneven force may cause the shape of the tire blank to deform in certain areas, thereby affecting the ovality. If the weight distribution of the trolley is uneven, a certain part of the tire blank may bear greater pressure, which will cause shape changes. On the trolley, the tire blank may be compressed in a static state, and this static compression may cause shape changes in some areas, thereby affecting the ovality. If the tire blank stays on the trolley for a period of time, it may be subjected to certain dynamic loads, which further affects the actual shape of the tire blank.

[0003] The ovality deviation will cause uneven force on the tire during the vulcanization process, resulting in local stress concentration and increasing the risk of cracking. It will also cause some areas of the tire to be subjected to excessive compression or tension during vulcanization, thereby triggering cracking. During the vulcanization process, the irregular shape of the tire will cause uneven distribution of heat and pressure, and some areas may be over-vulcanized or under-vulcanized, thus affecting the performance of the material. Due to uneven vulcanization, the rubber in some parts may be insufficiently crosslinked, which will cause a decrease in material strength and is prone to degumming or cracking.

[0004] In addition, the bead is the part where the rubber materials are joined in tire manufacturing. If the ovality is not corrected and directly vulcanized, the stress situation at the joint will become complex, which may lead to poor adhesion.

[0005] Degumming risk: If the adhesion strength of the bead is insufficient during the vulcanization process, uneven force will cause degumming at the joint, thereby triggering structural problems. During the vulcanization process, if the ovality of the tire blank is not corrected, it may cause the wiring or steel belt in some areas to be exposed, resulting in the phenomenon of "wire exposure"; internal defects such as bubbles or cracks may be formed, which will affect the integrity of the bead. The uncorrected ovality will cause imbalance of the tire during use, increase the load change during driving, and accelerate the damage of the bead; due to problems such as cracking, degumming and wire exposure, the overall life of the tire will be significantly shortened, increasing the replacement frequency and cost. Summary of the Utility Model

[0006] Based on this, the present utility model provides an ovality correction device for a tire embryo, and the ovality correction device includes:

[0007] An annular base, which is adapted to be installed on a tire embryo storage rack in front of a vulcanizer, and the annular base forms a slide rail along its radial direction;

[0008] At least two support blocks, which are movably arranged on the annular base along the radial direction of the slide rail, and the at least two support blocks together form an annular support ring, and the outer ring of the annular support ring is adapted to support the bead of the tire embryo;

[0009] A driving mechanism, which drives the radial movement of at least two support blocks simultaneously or independently, and the driving mechanism drives the support blocks to have a correction state and a non-working state. When switching from the non-working state to the correction state, the driving mechanism drives at least two support blocks to move radially outward to abut against the inside of the bead of the tire embryo so as to adjust it from an oval shape to a perfect circle.

[0010] In some embodiments, the ovality correction device for a tire embryo includes N support blocks, and N is an even number.

[0011] In some embodiments, the ovality correction device for a tire embryo includes 4 support blocks.

[0012] In some embodiments, the driving mechanism is a driving cylinder, and the driving cylinder is installed in the middle cavity of the annular base.

[0013] In some embodiments, the support block includes an arc-shaped outer wall and a slider formed on the annular outer wall, and the slider is connected to the driving mechanism.

[0014] In some embodiments, the driving mechanism includes a four-jaw cylinder, and the output end of the four-jaw cylinder has four push blocks, and the push blocks are fixedly connected to the slider through connecting rods.

[0015] Through effective ovality correction, the present utility model can significantly reduce the occurrence probability of defects such as bead cracking, degumming, and wire exposure, thereby improving the overall performance and safety of the tire and reducing the subsequent maintenance and replacement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the correction device provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Please refer to Figure 1, in this embodiment of the present utility model, an embryo ovality correction system is provided. The correction system includes a vulcanizer, an embryo storage tray rack, a photoelectric sensor, and a four-wheel drive embryo ovality correction device. The correction device is installed on the embryo storage tray rack. The ovality correction device includes an annular base 1, four support blocks 2, and a drive mechanism 3. The annular base 1 is adapted to be installed on the embryo storage rack in front of the vulcanizer, and the annular base forms a slide rail along its radial direction.

[0018] Among them, the four support blocks are arranged at the four equal division points of the annular base. Specifically, the annular base is divided into four equal division regions, and the central angle of each region is 90 degrees. The first support block is located at the 0-degree position (directly above), the second support block is located at the 90-degree position (right side), the third support block is located at the 180-degree position (directly below), and the fourth support block is located at the 270-degree position (left side). The four support blocks are evenly distributed around the periphery of the annular base, and a certain gap is reserved between the adjacent edges of each support block. When the support blocks move, these gaps allow the support blocks to move apart or approach each other, thus forming support rings of different sizes. It is necessary to ensure that the gap between the support blocks is large enough to prevent interference during movement and ensure the free movement of the support blocks. In addition, when the support blocks move outward, the four support blocks move away from each other, forming a larger circle to support the outside of the embryo, which is suitable for correcting embryos with a larger ovality. When the support blocks move inward, the four support blocks approach the center point, forming a smaller circle, which is suitable for correcting embryos with a smaller ovality.

[0019] The four support blocks 2 are movably arranged on the annular base 1 along the radial direction of the slide rail. The four support blocks together form an annular support ring, and the outer ring of the annular support ring is adapted to support the bead of the embryo. The drive mechanism drives the radial movement of the four support blocks simultaneously or independently. The drive mechanism drives the support blocks to have a correction state and a non-working state. When switching from the non-working state to the correction state, the drive mechanism drives at least the four support blocks to move radially outward to abut against the inside of the embryo bead to adjust it from an oval shape to a round shape. The correction method includes: 1) The photoelectric sensor detects that the embryo reaches the embryo tray rack; 2) The drive mechanism drives the support blocks to switch from the non-working state to the correction state. When the support blocks are in the correction state, the annular outer wall formed by them matches the standard shape of the embryo bead. After maintaining for 20 - 40 minutes, the support blocks return to the non-working state; Step 3) Repeat Step 2), the ovality of the embryo bead is corrected, and the manipulator descends to send the tire into the vulcanizer.

[0020] In some embodiments, the annular support ring is in an inclined state, and the inclination angle is the same as the placement angle of the embryo in the vulcanizer. In this embodiment, it is 3°. In some embodiments, the support block includes an arc-shaped outer wall 21 and a slider 22 formed on the annular outer wall, and the slider 22 is connected to the driving mechanism 3. The driving mechanism includes a four-jaw cylinder, and the output end of the four-jaw cylinder has four push blocks 31, and the push blocks 31 are fixedly connected to the slider 22 through connecting rods 32.

[0021] In this embodiment, the slider 22 and the annular base are connected by a plurality of sliding rods 33. The sliding rods are designed parallel to the connecting rod 32. One end of the sliding rod 33 is connected to the slider 22 through a fixed seat 34, and the other end slidably passes through a sliding seat 35, and the sliding seat 35 is fixedly connected to the annular base.

[0022] In a further preferred embodiment, an arc-shaped block 23 is provided above the arc-shaped outer wall 21 provided by the present utility model. The arc-shaped block 23 is inclined towards the annular base 1 compared to the arc-shaped outer wall 21. The purpose of this measure is that the arc-shaped outer wall contacts the inner side of the tire, while the arc-shaped block contacts the outer edge of the tire. Both match the shape of the embryo, so that not only the main body of the tire is corrected, but also the outer edge is considered, and the correction result is better.

[0023] In addition, an even number of support blocks can be provided, and it can be understood that the larger the number of support blocks, the better the correction effect. However, too many support blocks will cause problems such as a more complex design. Those skilled in the art can make appropriate changes or substitutions according to the foregoing design.

[0024] Effect evaluation of the improved four-wheel embryo ellipticity correction device:

[0025] The four-wheel embryo bead ellipticity correction device was installed on machine A09# on April 3, and the four-wheel embryo bead ellipticity correction device was installed on A03#, A10#, A16#, A17#, and A25#. It can be found that after the installation of the four-wheel embryo bead ellipticity correction device, the bead exposure (606) defect of the special high-end tire 12.00R20-20PR EZ861H decreased by 89.63%, which is significantly higher than the correction system provided in Example 1.

[0026] If the statistical data in January is used as the benchmark, it can be known that the number of defects that can be reduced for code 606 is: 352, and the number of defects that can be reduced for code 102 (bead crack) is: 18;

[0027] According to the company's benefit calculation standard, the income for each reduced downgraded tire is: 175 yuan; the income for each reduced repaired tire is: 50 yuan;

[0028] The annual income after the transformation of a total of seven vulcanizers is: (352 pieces * 175 yuan / piece + 18 pieces * 50 yuan / piece) * 7 sets = 437,500 yuan. Through effective ovality correction, the utility model can significantly reduce the occurrence probability of defects such as bead cracking, delamination, and wire exposure, thereby improving the overall performance and safety of the tire and reducing subsequent maintenance and replacement costs.

Claims

1. An embryo ellipticity correction device, characterized in that The described ellipticity correction device includes: A ring base, which is adapted to be installed on the embryo storage rack in front of the vulcanizer. The ring base forms a slide rail along its radial direction; At least two support blocks, which are movably arranged on the ring base along the radial direction of the slide rail. The at least two support blocks together form a ring-shaped support ring, and the outer ring of the ring-shaped support ring is adapted to support the bead of the embryo; A driving mechanism, which simultaneously or independently drives the radial movement of at least two support blocks. The driving mechanism drives the support blocks to have a correction state and a non-working state. When switching from the non-working state to the correction state, the driving mechanism drives at least two support blocks to move radially outward to abut against the inside of the bead of the embryo so as to adjust it from an elliptical shape to a circular shape.

2. The embryo ovality correction device according to claim 1, characterized in that The embryo ellipticity correction device includes N support blocks, and N is an even number.

3. The embryo ovality correction device according to claim 2, characterized in that, The embryo ellipticity correction device includes 4 support blocks.

4. The embryo ellipticity correction device according to claim 2, characterized in that, The driving mechanism is a driving cylinder, and the driving cylinder is installed in the middle cavity of the ring base.

5. The embryo ovality correction device according to claim 1, characterized in that, The support block includes an arc-shaped outer wall and a slider formed on the ring-shaped outer wall, and the slider is connected to the driving mechanism.

6. The tire embryo ellipticity correction device according to claim 1, characterized in that, The driving mechanism includes a four-jaw cylinder, and the output end of the four-jaw cylinder has four push blocks, and the push blocks are fixedly connected to the slider through connecting rods.

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