Green tire ovality correction system and correction method thereof

Abstract

The invention provides a tire blank ovality correction system, the correction system comprises a vulcanizing machine, a tire blank storage tray rack, a photoelectric sensor and a correction device, the correction device is installed on the tire blank storage tray rack, and the correction method comprises the following steps: 1) the photoelectric sensor detects that a tire blank reaches the tire blank tray rack; (2) the driving mechanism drives the supporting block to be switched from the non-working state to the correction state, when the supporting block is in the correction state, the formed annular outer wall is matched with the standard tire blank seam allowance in shape, and after the state is kept for 20-40 min, the supporting block is restored to the non-working state; and (3) repeating the step (2), correcting the ovality of the bead of the tire blank, and descending the manipulator to feed the tire into a vulcanizing machine.

Description

Technical Field

[0001] The invention belongs to tires, and in particular relates to a tire blank ovality correction system. Background Art

[0002] Vulcanization allows rubber molecules to form a three-dimensional network structure, improving its strength and wear resistance, allowing the tire to withstand greater pressure and wear during driving. Vulcanized rubber has better elasticity and flexibility, which is essential for the performance of tires under various road conditions. Vulcanized rubber will be more stable in high and low temperature environments and less likely to deform, which helps to extend the service life of the tire. Before vulcanization, the tire is stored in a tire trolley. On the trolley, the tire may be subjected to uneven pressure due to different support points. This uneven force may cause the shape of the tire to deform in certain areas, which in turn affects the ovality. If the weight of the trolley is unevenly distributed, a part of the tire may be subjected to greater pressure, which will cause shape changes. On the trolley, the tire may be compressed in a static state, and this static compression may cause shape changes in some areas, which in turn affects the ovality. If the tire 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.

[0003] Ovality deviation can cause uneven stress on the tire during vulcanization, resulting in local stress concentration and increased risk of cracking. It can also cause certain areas of the tire to be over-compressed or stretched during vulcanization, which can cause cracking. During the vulcanization process, the irregular shape of the tire can lead to uneven distribution of heat and pressure, and some areas may be over- or under-vulcanized, which affects the performance of the material. Due to uneven vulcanization, the rubber in some parts may not be sufficiently cross-linked, which can cause the material strength to decrease and be prone to degumming or cracking.

[0004] In addition, the sub-mouth is the part of the seam of rubber materials in tire manufacturing. If the ovality is not corrected and vulcanized directly, the stress situation at the seam will become complicated, which may lead to poor bonding.

[0005] Risk of debonding: If the bonding strength of the tyre is insufficient during the vulcanization process, uneven force will cause debonding at the joint, which will lead to structural problems. During the vulcanization process, if the ovality of the tire is not corrected, wiring or steel belts in certain areas may be exposed, causing "wire exposure"; internal defects such as bubbles or cracks may form, which will affect the integrity of the tyre. Uncorrected ovality will cause the tire to be unbalanced during use, increase load changes during driving, and accelerate damage to the tyre; due to problems such as cracking, debonding and wire exposure, the overall life of the tire will be significantly shortened, increasing the frequency and cost of replacement. Summary of the invention

[0006] Based on this, the present invention provides a tire blank ovality correction system, which includes a vulcanizer, a tire blank storage tray rack, a photoelectric sensor, and a correction device, wherein the correction device is installed on the tire blank storage tray rack, and the ovality correction device includes:

[0007] An annular base, wherein the annular base is suitable for being installed on a tire blank storage rack in front of a vulcanizer, and the annular base forms a slide rail along its radial direction;

[0008] At least four support blocks are movably arranged on the annular base along the radial direction of the slide rail, and the at least four support blocks integrally form an annular support ring, the outer ring of which is suitable for supporting the embryo mouth;

[0009] A driving mechanism, wherein the driving mechanism drives the radial movement of at least four support blocks simultaneously or independently, wherein the driving mechanism drives the support blocks to have a correction state and a non-working state, and when switching from the non-working state to the correction state, the driving mechanism drives the at least four support blocks to move radially outward to contact with the inside of the embryo mouth so as to adjust the embryo from an ellipse to a perfect circle;

[0010] Correction methods include:

[0011] 1) The photoelectric sensor detects that the embryo arrives at the embryo tray rack;

[0012] 2) The driving mechanism drives the support block to switch from the non-working state to the correction state. When the support block is in the correction state, the annular outer wall formed by it matches the standard tire blank mouth shape. After maintaining for 20-40 minutes, the support block returns to the non-working state;

[0013] Step 3) repeats step 2), the ovality of the tire blank is corrected, and the robot descends to send the tire into the vulcanizer.

[0014] In some embodiments, the annular support ring is in an inclined state, and the inclination angle is consistent with the placement angle of the tire blank inside the vulcanizer.

[0015] 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.

[0016] In some embodiments, the driving mechanism includes a four-claw cylinder, the output end of the four-claw cylinder has four push blocks, and the push blocks are fixedly connected to the slider via a connecting rod.

[0017] In some embodiments, the four support blocks are disposed at four equal points of the annular base.

[0018] In some embodiments, the slider is connected to the annular base via a plurality of sliding rods, the sliding rods are designed to be parallel to the connecting rods, one end of the sliding rod is connected to the slider via a fixed seat, and the other end can slide through the sliding seat, and the sliding seat is fixedly connected to the annular base.

[0019] In some embodiments, the four support blocks are evenly distributed around the periphery of the annular base, and a certain gap is reserved between adjacent edges of each support block.

[0020] In some embodiments, the inclination angle of the annular support ring and the placement angle of the tire blank inside the vulcanizer are 3°.

[0021] In some embodiments, an arc-shaped block is provided above the arc-shaped outer wall, and the arc-shaped block is inclined toward the annular base compared to the arc-shaped outer wall.

[0022] The present invention can significantly reduce the probability of defects such as tyre cracking, debonding and exposed wires through effective ovality correction, thereby improving the overall performance and safety of the tire and reducing subsequent repair and replacement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of the correction device provided by the present invention;

[0024] Figure 2 A schematic diagram of effect evaluation of the correction system provided in Example 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the effect evaluation of the correction system provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0026] Embodiment 1 Second drive tire embryo ovality correction device

[0027] See also Figure 1 The embodiment of the present invention provides a tire blank ovality correction system, which includes a vulcanizer, a tire blank storage tray rack, a photoelectric sensor, and a correction device. The correction device is installed on the tire blank storage tray rack. The ovality correction device includes an annular base 1, two opposite support blocks 2 and a driving mechanism. The annular base is suitable for being installed on the tire blank storage rack in front of the vulcanizer, and the annular base forms a slide rail along its radial direction; it can be movably arranged on the annular base along the radial direction of the slide rail, and the support block as a whole forms an annular support ring, and the outer ring of the annular support ring is suitable for supporting the tire blank mouth; the driving mechanism drives the radial movement of the support block simultaneously or independently, and the drive mechanism drives the support block 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 the support block to move radially outward to collide with the inside of the tire blank mouth to adjust it from an ellipse to a perfect circle.

[0028] In this embodiment, the driving mechanism is a cylinder, and the two support blocks are designed relative to each other. The two relative slides on the cylinder drive the two relative support blocks to move away from or closer to each other. It can be understood that when the two support blocks are away from each other, there is a gap between them to reserve space for the two to move closer. In this embodiment, the cylinder is the same cylinder, and two slides are designed on it to drive the two support blocks to move at the same time.

[0029] The correction method includes photoelectric detection of the embryo, delaying the expansion of the cylinder for 2 minutes, contracting the cylinder for 30 minutes - expanding the cylinder for 30 minutes - lowering the robot - contracting the cylinder, and programming to implement automated operation to correct the ovality of the embryo mouth.

[0030] Table 1 shows the daily statistics of the appearance defect of the ultra-high-end tire 12.00R20-EZ861H, the exposed thread (606), and Table 2 shows the statistics of the cracking and glue shortage of the tire. The A01 machine will be equipped with a two-drive tire blank ovality correction device on the pallet from January 6, 2024. It can be seen that after the A01 machine pallet was modified, the defect of the tire mouth was indeed improved, with slight glue shortage and exposed thread line decreased by 25.63%.

[0031] Table 1

[0032]

[0033]

[0034] 12.00R20-EZ861H appearance defect mouth dew (606) daily generation statistics, among which A01 machine January 6, 2024 pallet installed two-drive tire embryo ovality correction device

[0035] Table 2

[0036]

[0037] See also Figure 1 ,From the data comparison and analysis, the occurrence rate of sub-mouth defects of the improved A01 machine decreased by 70.64%. This device can effectively reduce the occurrence of sub-mouth dew lines.

[0038] Embodiment 2 Four-wheel drive tire ovality correction device

[0039] The inventor found that according to the test data of A01# machine, the spur defect of the ultra-high-end tire 12.00R20-20PR EZ861H dropped from 36.28% to 10.65%, a decrease of 70.64%, but there was still an incidence of 10.65%. The inventor carefully analyzed the entire correction process and the vulcanization process, and the main reasons are: 1. The ovality of the spur of the tire embryo is greater than the ovality of the correction device, and the spur of the tire embryo cannot be corrected. The correction device will not be able to effectively adjust the tire embryo from an elliptical shape to an ideal circle. The design of the correction device needs to be able to adapt to the shapes of various tire embryos, especially for ultra-high-end tires, which may require higher correction accuracy and flexibility. 2. The tire embryo is not centered, that is, the placement angle of the tire embryo is different from the placement angle in the vulcanizer. In Example 1, the tire embryo is at a completely horizontal angle, and the rim itself is tilted when designed to match the suspension system and driving characteristics of the vehicle. In this case, the tilted placement of the tire embryo in the vulcanizer can ensure that the tire fits the rim better. During the correction process, if the tire blank is placed at an angle that does not match the angle in the vulcanizer, the correction may not be effective. This means that even if the ovality correction is performed, the tire blank may still be subject to uneven pressure and heat during the subsequent vulcanization process, resulting in a decrease in the quality of the final product.

[0040] Based on the aforementioned invention process, the inventor provides a tire blank ovality correction system in this embodiment, which correction system includes a vulcanizer, a tire blank storage tray rack, a photoelectric sensor, and a four-wheel drive tire blank ovality correction device. The correction device is installed on the tire blank storage tray rack. The ovality correction device includes an annular base 1, four support blocks 2 and a driving mechanism 3. The annular base 1 is suitable for being installed on the tire blank storage rack in front of the vulcanizer, and the annular base constitutes a slide rail along its radial direction.

[0041] Among them, four support blocks are arranged at the four equal points of the annular base. Specifically, the annular base is divided into four equal areas, each of which has a central angle of 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 separate or approach each other, thereby forming support circles of different sizes. It is necessary to ensure that the gaps between the support blocks are large enough to prevent interference during the 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 to form a larger circle supporting the outside of the embryo, which is suitable for correcting the embryo with a larger ovality. When the support blocks move inward, the four support blocks approach the center point to form a smaller circle, which is suitable for correcting the embryo with a smaller ovality.

[0042] Four support blocks 2 are movably arranged on the annular base 1 along the radial direction of the slide rail, and the four support blocks constitute an annular support ring as a whole, and the outer ring of the annular support ring is suitable for supporting the tire embryo mouth; the driving mechanism drives the radial movement of the four 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 four support blocks to move radially outward to contact with the inside of the tire embryo mouth so as to adjust it from an ellipse to a perfect circle; the correction method includes: 1) the photoelectric sensor detects that the tire embryo arrives at the tire embryo tray rack; 2) the driving mechanism drives the support blocks to switch from the non-working state to the correction state, and when the support blocks are in the correction state, the annular outer wall formed by them matches the standard tire embryo mouth shape, and after maintaining for 20-40 minutes, the support blocks return to the non-working state; step 3) repeat step 2), the ovality of the tire embryo mouth is corrected, and the manipulator descends to send the tire into the vulcanizer.

[0043] In some embodiments, the annular support ring is in an inclined state, and the inclination angle is consistent with the placement angle of the tire blank inside 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 a driving mechanism 3. The driving mechanism includes a four-claw cylinder, and the output end of the four-claw cylinder has four push blocks 31, and the push blocks 31 are fixedly connected to the slider 22 through a connecting rod 32.

[0044] In this embodiment, the slider 22 is connected to the annular base via a plurality of sliding rods 33, and the sliding rods are designed to be parallel to the connecting rods 32. One end of the sliding rod 33 is connected to the slider 22 via a fixed seat 34, and the other end can slide through a sliding seat 35, and the sliding seat 35 is fixedly connected to the annular base.

[0045] In a further preferred embodiment, an arc block 23 is provided above the arc outer wall 21 provided by the present invention, and the arc block 23 is inclined toward the annular base 1 compared to the arc outer wall 21. The purpose of this measure is that the arc outer wall contacts the inner side of the tire, and the arc block contacts the outer edge of the tire. Both match the shape of the tire blank, so that it not only takes into account the main body correction of the tire, but also takes into account the outer edge, and the correction result is better.

[0046] In addition, an even number of support blocks can be provided, and it is understood that the greater the number of support blocks, the better the correction effect, but too many support blocks will cause problems such as a more complicated design. Those skilled in the art can make appropriate changes or substitutions based on the above design.

[0047] Effect evaluation of the improved four-wheel drive tire ovality correction device:

[0048] See also Figure 2 On April 3, the A09# machine was installed with a four-wheel drive tire embryo ovality correction device, and A03#, A10#, A16#, A17#, and A25# were installed with a four-wheel drive tire embryo ovality correction device. It can be found that after the four-wheel drive tire embryo ovality correction device was installed, the ultra-high-end tire 12.00R20-20PR EZ861H ovality exposure line (606) defect decreased by 89.63%, which is significantly higher than the correction system provided in Example 1.

[0049] If the January statistics are used as a benchmark, it can be seen that after the transformation, the number of code 606 defects can be reduced by 352, and the number of code 102 (sprocket cracks) can be reduced by 18;

[0050] According to the company's profit calculation standard, the profit for each tire reduced is 175 yuan; the profit for each tire repaired is 50 yuan;

[0051] The annual income of the seven vulcanizers after transformation is: (352 tires * 175 yuan / tire + 18 tires * 50 yuan / tire) * 7 units = 437,500 yuan. The present invention can significantly reduce the probability of defects such as cracking, degumming and exposed wires through effective ovality correction, thereby improving the overall performance and safety of the tire and reducing subsequent maintenance and replacement costs.

Claims

1. A tire embryo ovality correction system, characterized in that: The correction system comprises a vulcanizer, a tire blank storage tray rack, a photoelectric sensor, and a correction device, wherein the correction device is mounted on the tire blank storage tray rack, and the ovality correction device comprises: an annular base, wherein the annular base is suitable for being mounted on the tire blank storage rack in front of the vulcanizer, and the annular base forms a slide rail along its radial direction; At least four support blocks are movably arranged on the annular base along the radial direction of the slide rail, and the at least four support blocks integrally form an annular support ring, the outer ring of which is suitable for supporting the embryo mouth; A driving mechanism, wherein the driving mechanism drives the radial movement of at least four support blocks simultaneously or independently, wherein the driving mechanism drives the support blocks to have a correction state and a non-working state, and when switching from the non-working state to the correction state, the driving mechanism drives the at least four support blocks to move radially outward to contact with the inside of the embryo mouth so as to adjust the embryo from an ellipse to a perfect circle; Correction methods include: 1) The photoelectric sensor detects that the embryo arrives at the embryo tray rack; 2) The driving mechanism drives the support block to switch from the non-working state to the correction state. When the support block is in the correction state, the annular outer wall formed by it matches the standard tire blank mouth shape. After maintaining for 20-40 minutes, the support block returns to the non-working state; Step 3) repeats step 2), the ovality of the tire blank is corrected, and the robot descends to send the tire into the vulcanizer.

2. The tire embryo ovality correction system according to claim 1, characterized in that: The annular support ring is in an inclined state, and the inclination angle is consistent with the placement angle of the tire blank inside the vulcanizer.

3. The tire embryo ovality correction system according to claim 1, characterized in that: The support block comprises an arc-shaped outer wall and a sliding block formed on the annular outer wall, and the sliding block is connected to the driving mechanism.

4. The tire embryo ovality correction system according to claim 1, characterized in that: The driving mechanism comprises a four-claw cylinder, the output end of the four-claw cylinder is provided with four push blocks, and the push blocks are fixedly connected with the sliding block through a connecting rod.

5. The tire embryo ovality correction system according to claim 1, characterized in that: The four support blocks are arranged at the quarter points of the annular base.

6. The tire embryo ovality correction system according to claim 1, characterized in that: The slider is connected to the annular base via a plurality of sliding rods, the sliding rods are designed to be parallel to the connecting rods, one end of the sliding rod is connected to the slider via a fixed seat, and the other end can slide through the sliding seat, and the sliding seat is fixedly connected to the annular base.

7. The tire embryo ovality correction system according to claim 1, characterized in that: The four support blocks are evenly distributed around the periphery of the annular base, and a certain gap is reserved between adjacent edges of each support block.

8. The tire embryo ovality correction system according to claim 1, characterized in that: The inclination angle of the annular support ring and the placement angle of the tire blank inside the vulcanizer are 3°.

9. The tire embryo ovality correction system according to claim 1, characterized in that: An arc block is arranged above the arc outer wall, and the arc block is inclined toward the annular base compared with the arc outer wall.

10. A method for correcting tire embryo ovality, characterized in that: The correction method includes: 1) The photoelectric sensor detects that the embryo arrives at the embryo tray rack; 2) The tire blank ovality correction device switches from the non-working state to the correction state. When the support block is in the correction state, the annular outer wall formed by it matches the standard tire blank mouth shape. After maintaining for 20-40 minutes, the support block returns to the non-working state; Step 3) repeats step 2), the ovality of the tire blank is corrected, and the robot descends to send the tire into the vulcanizer.

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