Turn-up method and turn-up mechanism

Abstract

The present application provides a turn-up method and a turn-up mechanism for rolling a sidewall in the radial direction of a tire using a rolling roller assembly. The turn-up method includes: Step S1 in which a limiting device applies a pressure within a first predetermined range to the rolling roller assembly so that when the rolling roller assembly moves outward along the radial direction of the tire, it abuts against the sidewall and adheres the sidewall to the side surface of the tire blank; and Step S2 in which the limiting device applies a pressure within a second predetermined range to the rolling roller assembly to move the rolling roller assembly inward along the radial direction of the tire, wherein the value of the pressure within the first predetermined range is smaller than the value of the pressure within the second predetermined range. The turn-up method of the present application solves the problem of the prior art that the bonding quality of the sidewall of the tire is low.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims priority to a patent application filed with the China National Intellectual Property Administration on June 17, 2022, with application number 202210690241.8 and invention title "Turn - up Method and Turn - up Mechanism", and all its contents are incorporated herein by reference.

[0002] This application relates to the technical field of rubber tires, and specifically to a turn - up method and a turn - up mechanism.

Background Art

[0003] When turning up and molding an existing tire, a bladder drum is mainly used to turn up the sidewall of the tire. By inflating the bladder to bond the sidewall, the problem of indentation on the side of the tire can be avoided. However, the bladder drum has problems such as complicated bladder replacement, high bladder cost, and worse forming quality of the tire bead compared to a mechanical drum. Therefore, the defective rate of the tire is high and the cost is still high.

[0004] In the case of a mechanical drum, the cost is low, but when rolling the sidewall, there are problems such as a large rolling pressure that easily leaves indentations or a small rolling pressure that results in incomplete bonding of the sidewall. Therefore, even though the cost is lower than that of a bladder drum, its applicability is low.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The main object of this application is to provide a turn - up method and a turn - up mechanism for solving the problem of the poor bonding quality of the sidewall of the tire in the prior art.

Means for Solving the Problems

[0006] To achieve the above object, according to one selectable embodiment of the present application, a turn-up method is provided in which a rolling roller assembly is used to roll the sidewall in the radial direction of the tire. The turn-up method includes: a step S1 in which a limiting device applies a pressure within a first predetermined range to the rolling roller assembly so that when the rolling roller assembly moves outward along the radial direction of the tire, it abuts against the sidewall and adheres the sidewall to the side surface of the tire blank; and a step S2 in which the limiting device applies a pressure within a second predetermined range to the rolling roller assembly to move the rolling roller assembly inward along the radial direction of the tire. The value of the pressure within the first predetermined range is smaller than the value of the pressure within the second predetermined range.

[0007] In one selectable embodiment, the turn-up method further includes a step S3 after executing step S2. In step S3, pressure is applied to the sidewall by a second turn-up structure to adhere the sidewall to the side surface of the tire blank. The second turn-up structure rolls two side surfaces of the tire blank simultaneously.

[0008] In one selectable embodiment, the turn-up method further includes a step of using a limiting cylinder as the limiting device and adjusting the air supply pressure of the limiting cylinder in steps S1 and S2 to adjust the pressure on the rolling roller assembly respectively.

[0009] According to one selectable embodiment of the present application, a turn-up mechanism provided on a spindle assembly is provided. The turn-up mechanism includes a plurality of first turn-up structures provided in the circumferential direction of the spindle assembly. The turn-up mechanism is used to implement the above turn-up method. The first turn-up structure includes a rolling roller assembly provided on one side of the tire for rolling the sidewall of the tire, a rolling device drivingly connected to the rolling roller assembly for driving the rolling roller assembly to move in the radial direction of the tire, and a limiting device drivingly connected to the rolling roller assembly for applying a force for moving the rolling roller assembly towards the tire when the tire rotates.

[0010] In one selectable embodiment, the rolling pressure device includes a first drive rod drivingly connected to the rolling roller assembly, and a first drive assembly connected to the first drive rod for driving the rolling roller assembly to move by the first drive rod.

[0011] In one selectable embodiment, the limiting device includes a second drive rod rotatably connected to the first drive rod, and a second drive assembly connected to the second drive rod for driving the rolling roller assembly to press the tire by the first drive rod.

[0012] In one selectable embodiment, the first turn-up structure further includes a support assembly connected to the first drive rod for supporting the sidewall outside the turn-up mechanism, and the rolling roller assembly is rotatably provided on the support assembly or the first drive rod.

[0013] In one selectable embodiment, the first turn-up structure further includes a third drive rod with one end rotatably connected to the support assembly and the other end rotatably connected to the second drive rod, and the first drive rod, the support assembly, the third drive rod and the second drive rod are sequentially rotatably connected to form a four-bar linkage mechanism.

[0014] In one selectable embodiment, the turn-up mechanism further includes a second turn-up structure. The first turn-up structure and the second turn-up structure respectively turn up and roll the different positions of the sidewall. The first turn-up structure is provided inside the tire and rolls the sidewall at the end close to the center of the tire, and the second turn-up structure is provided outside the tire and rolls the sidewall at the end close to the tire tread.

[0015] In one selectable embodiment, the second turn-up mechanism includes two suspension arms that are symmetrically spaced apart and a turn-up space is formed therebetween, and a third drive assembly connected to the two suspension arms for driving the two suspension arms to move simultaneously to roll over the sidewalls on both sides of the tire.

[0016] The turn-up method applying the technical solution of the present application uses a rolling roller assembly to roll over the sidewall in the radial direction of the tire. Specifically, the turn-up method includes step S1 and step S2. In step S1, the rolling roller assembly moves outward along the radial direction of the tire. At this time, the rotation speed of the main shaft assembly of the tire is low and the centrifugal force generated by the rolling roller assembly is small. Therefore, the control device applies a pressure within a first predetermined range to the rolling roller assembly to bring the rolling roller assembly into abutting connection with the sidewall. In step S2, the rolling roller assembly moves inward along the radial direction of the tire. At this time, the rotation speed of the main shaft assembly of the tire is high and the centrifugal force generated by the rolling roller assembly is large. Therefore, if a large pressure is not applied to the rolling roller assembly, the rolling roller assembly may jump out and as a result, may not be able to return and reset. Therefore, the limiting device applies a pressure within a second predetermined range to the rolling roller assembly to enable the rolling roller assembly to reset smoothly. At this time, the value of the pressure within the first predetermined range is smaller than the value of the pressure within the second predetermined range. By the above operation, the pressure is controlled by period and step, and the force with which the rolling roller assembly presses the sidewall is always controlled within a predetermined range, thereby avoiding the problems of indentation and incomplete bonding of the sidewall.

Brief Description of the Drawings

[0017] The accompanying drawings of the specification that form a part of this application are used to provide a further understanding of this application. The exemplary embodiments and their descriptions of this application are for interpreting this application, but do not constitute an inappropriate limitation to this application. The accompanying drawings are as follows.

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0018] It should be noted that the embodiments of this application and the features in the embodiments can be combined with each other without conflict. Hereinafter, this application will be described in detail with reference to the accompanying drawings in combination with the embodiments.

[0019] In order to solve the problem of the prior art that the quality of the bonding of the sidewall of the tire is poor, this application provides a turn-up method and a turn-up structure.

[0020] When the mechanical drum uses the rolling roller assembly 201 to turn up and roll the sidewall of the tire, the biggest drawback is as follows. The rolling roller assembly 201 is likely to leave indentations during the process of rolling the tread, which affects the quality and appearance of the tire. However, if the pressure applied by the rolling roller assembly 201 to press the tread is small, it cannot be attached to the sidewall due to the action of centrifugal force during the high-speed rotation process of the main shaft assembly 10. As a result, the sidewall and the tire blank cannot be completely attached. To solve the above problems, the turn-up method of this application uses the rolling roller assembly 201 to roll the sidewall in the radial direction of the tire. Referring to FIGS. 1 and 2, specifically, the turn-up method includes step S1 and step S2. In step S1, the rolling roller assembly 201 moves outward along the radial direction of the tire. At this time, the rotation speed of the main shaft assembly 10 of the tire is low, the centrifugal force generated by the rolling roller assembly 201 is small, and indentations are prevented from being generated when the rolling roller assembly 201 rolls the sidewall. To avoid problems such as the rolling roller assembly 201 not moving when the pressure on the tire blank by the rolling roller assembly 201 is too large, in this application, the control device applies a pressure within a first predetermined range to the rolling roller assembly 201 to bring the rolling roller assembly 201 into contact connection with the sidewall. In step S2, the rolling roller assembly 201 moves from the outside to the inside along the radial direction of the tire. At this time, the rotation speed of the main shaft assembly 10 of the tire is high, and the centrifugal force generated by the rolling roller assembly 201 is large. Therefore, if a large pressure is not applied to the rolling roller assembly 201, the rolling roller assembly 201 may fly out, and as a result, it may not be able to return and reset. Therefore, the limiting device applies a pressure within a second predetermined range to the rolling roller assembly 201 to enable the rolling roller assembly 201 to smoothly return when the tire rotates at a high speed and to reset the following support assembly. At this time, the value of the pressure within the first predetermined range is smaller than the value of the pressure within the second predetermined range.Through the above operations, the pressure is controlled by period and step, and the force with which the rolling roller assembly 201 presses the sidewall is always controlled within a predetermined range, thereby avoiding the problems of indentation and incomplete bonding of the sidewall.

[0021] In addition, the following situation also exists in the turn-up method of the present application. During the turn-up process, does the rotational speed of the spindle assembly always remain the same, or is the rotational speed of the spindle assembly when the rolling roller assembly moves outward greater than the rotational speed of the spindle assembly when the rolling roller assembly moves inward? At this time, on the premise of overcoming the centrifugal force, the limiting device of the present application applies a small force to the rolling roller assembly when the rolling roller assembly moves outward, but applies a large force to the rolling roller assembly when the rolling roller assembly moves inward. The purpose is to first apply a small force to bond the sidewall to the side surface of the tire blank during the process of the rolling roller assembly moving outward, and then apply a large force to the rolling roller assembly during the process of the rolling roller assembly resetting inward to flatten the sidewall and closely bond it to the tire blank, and at the same time prevent indentation as much as possible.

[0022] In order to reduce the occupied space of the turn-up mechanism, in this application, during the design, for some large-sized tires, the turn-up stroke of the first turn-up structure 20 is limited. The first turn-up structure 20 may not be able to roll over all the sidewalls when turning up the sidewall of the tire. Also, the current sidewall has the problem of incomplete bonding with the tire blank. Therefore, this application uses two mechanisms to roll over and bond the sidewalls respectively. Specifically, the turn-up method further includes step S3 after executing step S2. In step S3, pressure is applied to the sidewall by the second turn-up structure to bond the sidewall to the side surface of the tire blank. The second turn-up structure can roll over the two side surfaces of the tire blank simultaneously to bond the sidewall to the side surface of the tire blank.

[0023] To realize the adjustment of the pressure on the rolling roller assembly 201, the turn-up method uses a limiting cylinder as a limiting device and adjusts the air supply pressure of the limiting cylinder in steps S1 and S2 to adjust the pressure on the rolling roller assembly 201 respectively. When a large pressure is required, high-pressure gas is quickly filled into the limiting cylinder, thereby applying a large force to the rolling roller assembly 201. When a small force is required, it further includes steps where the principle is reversed.

[0024] The present application further provides a turning-up mechanism for implementing the above turning-up method, and this turning-up mechanism is provided on the spindle assembly 10. The turning-up mechanism includes a plurality of first turning-up structures 20 provided in the circumferential direction of the spindle assembly 10. The first turning-up structure 20 includes a rolling roller assembly 201 for rolling the sidewall of the tire, a first driving rod 21 drivingly connected to the rolling roller assembly 201, a first driving assembly 211 connected to the first driving rod 21 and for driving the rolling roller assembly 201 by the first driving rod 21 to move in the radial direction of the tire, and a limiting device drivingly connected to the rolling roller assembly 201 and for applying a force for moving the rolling roller assembly 201 toward the tire when the tire rotates.

[0025] The turn-up mechanism of the present application includes a plurality of first turn-up mechanisms 20. The plurality of first turn-up structures 20 are provided in the circumferential direction of the main shaft assembly 10. The first turn-up structure 20 includes a rolling roller assembly 201, a rolling pressure device, and a limiting device. The rolling pressure device includes a first driving rod 21 and a first driving assembly 211. Further, the first turn-up structure further includes a support assembly and a second driving assembly 221. The rolling roller assembly 201 is directly abutted against the sidewall 50 to roll-press the sidewall 50 of the tire, and thereby is used to press the sidewall 50 against the tire blank. The first driving rod 21 on the rolling pressure device is drivingly connected to the rolling roller assembly 201. The first driving assembly 211 is connected to the first driving rod 21 and drives the first driving rod 21 to swing, so as to move the rolling roller assembly 201 in the radial direction of the tire. The second driving assembly 221 pushes up the first driving rod 21 to press the tire against the rolling roller assembly 201. As a result, the rolling roller assembly 201 always rolls along the contour of the side surface of the tire blank during the movement process and maintains the contact with the tire blank. The stress situation of the structure at this time is that the second driving assembly 221 directly pushes and swings the first driving rod 21, so as to move the upper rolling roller assembly 201 to press the tire blank. By providing the above structure, the force transmission path is reduced, the force loss is reduced, the force transmission efficiency is improved, and thereby the sidewall 50 is bonded more stably.

[0026] In addition, the rolling roller assembly 201 of the present application is provided in the support assembly 25. According to one embodiment, the rolling roller assembly 201 includes a roller or a rolling roller, and the roller is rotatably provided at an end close to the side wall 50 of the support assembly 25. The second drive assembly 221 can directly press the side wall 50 by pushing the rolling roller assembly 201. According to a second embodiment, the second drive assembly 221 pushes the first drive rod 21, and the first drive rod 21 is connected to an end of the support assembly 25 close to the rolling roller assembly 201, and further pushes the rolling roller assembly 201 to press the side wall 50. According to a third embodiment, as shown in FIG. 2, the roller is rotatably provided at an end close to the side wall 50 of the support assembly 25, and the end of the support assembly 25 close to the rolling roller assembly 201 is rotatably connected to the first drive rod 21. The second drive assembly 221 is simultaneously connected to the first drive rod 21 and the support assembly 25, and the first drive rod 21 and the support assembly 25 apply pressure to the roller of the rolling roller assembly 201 respectively to press the side wall 50 against the roller.

[0027] After being lifted, the support assembly 25 forms an angle with the end perpendicular to the sidewall 50 of the tire or the end away from the tire, so that the sidewall 50 can be supported in a better shape, and it can effectively avoid the sidewall 50 pressed against the roller on the rolling roller assembly 201 from being attached to the tire blank. However, the portion of the sidewall 50 away from the roller on the rolling roller assembly 201 forms grooves in the portion close to the tire after the sidewall is turned up due to the shrinkage of the rubber material after the turn-up rod is pulled back. When the suspension arm is pressed against the groove later, wrinkles may occur. Therefore, in this application, by providing the roller on the rolling roller assembly 201 at the end located on the sidewall 50 of the support assembly 25, the rolling roller assembly 201 and the support assembly 25 are at the same distance from the center of the tire in the radial direction of the tire. Later, when the suspension arm rolls, it continues to roll following the rolling position of the rolling roller assembly 201, and the sidewall 50 is not pressed to cause wrinkles.

[0028] Both the first drive assembly 211 and the second drive assembly described above are driven by cylinders.

[0029] The first turn-up structure 20 further includes a second drive rod 22 and a third drive rod 23. The second drive rod 22 is connected to a second drive assembly 221. One end of the second drive rod 22 is rotatably connected to the first drive rod 21 and is used to push up and swing the first drive rod 21. One end of the third drive rod 23 is rotatably connected to an end of the support assembly 25 away from the rolling roller assembly 201, and the other end of the third drive rod 23 is rotatably connected to the second drive rod 22. The second drive assembly 221 drives the second drive rod 22 to move, thereby simultaneously moving and rotating the first drive rod 21 and the third drive rod 23. The first drive rod 21 and the third drive rod 23 rotate simultaneously to move the upper support assembly 25 upward to support the side wall 50 that has not been rolled. The first drive rod 21, the support assembly 25, the third drive rod 23, and the second drive rod 22 are sequentially rotatably connected to form a four-bar linkage mechanism.

[0030] To realize the movement of the rolling roller assembly 201 along the side surface of the tire blank, a fourth drive rod 24 is also provided in the first turn-up structure 20 of the present application. The fourth drive rod 24 is connected to the first drive assembly 211, and the fourth drive rod 24 is also rotatably connected to the first drive rod 21. Here, the first drive assembly 211 drives and rotates the first drive rod 21 by the fourth drive rod 24. The first drive assembly 211 employs a cylinder, and the cylinder is provided on the spindle assembly 10. The fourth drive rod 24 is provided movably in the axial direction of the spindle assembly 10. When operating, the cylinder pushes the fourth drive rod 24 to move it in the axial direction of the spindle assembly 10. The other end of the fourth drive rod 24 is hinged to the end of the first drive rod 21. The other end of the first drive rod 21 abuts against the sidewall 50 by the rolling roller assembly 201. The fourth drive rod 24 moves horizontally to drive the first drive rod 21 to swing, and presses the rolling roller assembly 201 against the sidewall 50 to slide it. Due to the swinging motion form, the problem that the rolling roller assembly 201 stops moving when it abuts against the recess or protrusion of the sidewall 50 is reduced.

[0031] One end of the first drive rod 21 is connected to the support assembly 25, and the other end of the first drive rod 21 is hinged to the fourth drive rod 24. Here, the second drive rod 22 is hinged to a portion between the support assembly 25 of the first drive rod 21 and the fourth drive rod 24, and the rolling roller assembly 201 is provided at an end close to the support assembly 25 of the first drive rod 21 or an end close to the sidewall 50 of the support assembly 25.

[0032] In this embodiment, by setting the connection positions of the fourth drive rod 24, the second drive rod 22, the support assembly 25 and the first drive rod 21, the rolling roller assembly 201 can smoothly and stably press the sidewall 50. Specifically, one end of the second drive rod 22 is hingedly connected to the first drive rod 21, and the other end of the second drive rod 22 is hingedly connected to the second drive assembly 221. Here, the third drive rod 23 is hingedly connected to a portion of the second drive rod 22 between the first drive rod 21 and the second drive assembly 221.

[0033] To support the non-bonded portion of the sidewall 50, a plurality of support rods are provided in the support assembly 25 of the present application. The plurality of support rods are spaced apart in a direction perpendicular to the sidewall 50 to support the sagging sidewall 50 as much as possible. Here, the first turn-up structure 20 further includes a plurality of drums provided in a one-to-one correspondence with each support rod, and the drums are rotatably fitted to the support rods so that the sidewall 50 can slide.

[0034] In order for the rolling roller assembly 201 to roll and press the sidewall 50 better and more smoothly, in the present application, the rolling roller assembly 201 is rotatably provided on the first drive rod 21 or the support assembly 25. Specifically, the rolling roller assembly 201 includes an annular rolling roller, and the rolling roller is provided at the end of the first drive rod 21, or the rolling roller is fitted to a support rod near one end of the sidewall 50 of the support assembly 25.

[0035] In addition, in order to reduce the space of the entire turning-up mechanism, in this embodiment, the stroke of the first turning-up structure 20 is limited, and a two-stage turning-up form is adopted. Specifically, the turning-up mechanism further includes a second turning-up structure 30. The first turning-up structure 20 is provided inside the tire, and the second turning-up structure 30 is provided outside the tire. The first turning-up structure 20 and the second turning-up structure 30 respectively turn up and press different positions of the sidewall 50, and the portion of the side surface of the tire blank close to the center position of the tire is pressed and bonded by the first turning-up structure 20, and the portion of the side surface of the tire blank close to the outer position of the tire is pressed and bonded by the second turning-up structure 30.

[0036] The second turning-up structure 30 includes two suspension arms and a third driving assembly. The two suspension arms are symmetrically spaced apart. The two suspension arms may be provided close to or spaced apart from each other, and a turning-up space is formed between the two suspension arms. When they approach each other, the ends of the suspension arms are bonded to the sidewall 50, and the sidewall 50 is bonded to the side surface of the tire blank by pressing. The third driving assembly is connected to the two suspension arms. The third driving assembly adopts a cylinder to drive the two suspension arms to move simultaneously to press the sidewalls 50 on both sides of the tire.

[0037] This application further provides a mechanical drum. The mechanical drum includes a spindle assembly 10 and two turning-up mechanisms. The two turning-up mechanisms are symmetrically provided with respect to the spindle assembly 10. The two turning-up structures respectively press the sidewalls on both sides of the tire. The turning-up mechanism is the turning-up mechanism described above. This mechanical drum abandons the existing bladder turning-up form and forms the pressing on the sidewall 50 by a cylinder, a link mechanism and a rolling roller assembly 201, so it has a long service life and saves costs.

[0038] In addition, the machine drum of this application further includes a lock ring structure 40. There are two lock ring structures 40, which are provided symmetrically with respect to the spindle assembly, located between the two turn-up mechanisms, and are used to lock the bead of the tire and fix the tire blank.

[0039] From the above description, it can be seen that the above embodiments of this application achieve the following technical effects. The turn-up mechanism of this application realizes the adjustment and control of the pressure of the rolling roller assembly. Specifically, when the rolling roller moves upward along the sidewall, the pressure of the limiting cylinder is adjusted to be small, and when the rolling roller moves downward along the sidewall, the pressure is adjusted to be large. When the suspension arm enters, the drum rotates at a high speed, the centrifugal force is large, and the pressure of the cylinder at this time is also large.

[0040] In the process of the turn-up operation of the conventional machine drum, when the rolling roller assembly faces upward, if the pressure of the limiting cylinder is too high, the rolling roller assembly cannot rise, so it is necessary to reduce the pressure at this time. If the pressure at this time is too high, the indentation of the sidewall will be deep, affecting the quality. When pulling back, it is necessary to increase the pressure to overcome the centrifugal force and make the rolling roller assembly return.

[0041] The above are only preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the spirit and principle of this application should be included within the scope of this application.

Explanation of Reference Numerals

[0042] 10 Spindle assembly 20 First turn-up structure 201 Rolling roller assembly 21 First drive rod 211 First drive assembly 22 Second drive rod 221 Second drive assembly 23 Third drive rod 24 Fourth drive rod 25 Support assembly 30 Second turn-up structure 40 Lock ring structure 50 Side wall

Claims

1. A turn-up method for rolling a sidewall (50) in the radial direction of a tire using a calender roller assembly (201), comprising: When the calender roller assembly (201) moves outward along the radial direction of the tire, the limiting device contacts the sidewall (50) and attaches the sidewall (50) to the side surface of the tire blank. Step S1 of applying a pressure within a first predetermined range to the calender roller assembly (201); The limiting device includes step S2 of applying a pressure within a second predetermined range to the calender roller assembly (201) to move the calender roller assembly (201) inward along the radial direction of the tire, wherein a value of the pressure within the first predetermined range is smaller than a value of the pressure within the second predetermined range. A turn-up method characterized by this.

2. The turn-up method further includes step S3 after performing step S2, In step S3, pressure is applied to the sidewall (50) by a second turn-up structure (30) to attach the sidewall (50) to the side surface of the tire blank. The second turn-up structure (30) simultaneously rolls two side surfaces of the tire blank. The turn-up method according to claim 1, characterized by this.

3. The turn-up method further includes the step of using a limiting cylinder as the limiting device and adjusting the air supply pressure of the limiting cylinder in step S1 and step S2 to respectively adjust the pressure on the calender roller assembly (201). The turn-up method according to claim 1 or 2, characterized by this.

4. A turn-up mechanism provided on a spindle assembly (10) and comprising a plurality of first turn-up structures (20) provided in the circumferential direction of the spindle assembly (10). The turn-up mechanism is used to implement the turn-up method according to any one of claims 1 to 3, and the first turn-up structure (20) includes: A calender roller assembly (201) provided on one side of the tire for rolling the sidewall (50) of the tire; A rolling device that is drivingly connected to the calender roller assembly (201) and drives the calender roller assembly (201) to move in the radial direction of the tire; A turn-up mechanism, characterized by comprising a limiting device that is drivingly connected to the rolling roller assembly (201) and applies a force for moving the rolling roller assembly (201) towards the tire when the tire rotates.

5. The rolling device is The turn-up mechanism according to claim 4, characterized by comprising a first drive rod (21) drivingly connected to the rolling roller assembly (201), and a first drive assembly (211) connected to the first drive rod (21) for driving the rolling roller assembly (201) to move by the first drive rod (21).

6. The limiting device is The turn-up mechanism according to claim 5, characterized by comprising a second drive rod (22) rotatably connected to the first drive rod (21), and a second drive assembly (221) connected to the second drive rod (22) for driving the rolling roller assembly (201) by the first drive rod (21) to press the tire.

7. The first turn-up structure (20) is The turn-up mechanism according to claim 6, further comprising a support assembly (25) connected to the first drive rod (21) for supporting the sidewall (50) outside the turn-up mechanism, wherein the rolling roller assembly (201) is rotatably provided on the support assembly (25) or the first drive rod (21).

8. The first turn-up structure (20) is further comprising a third drive rod (23) having one end rotatably connected to the support assembly (25) and the other end rotatably connected to the second drive rod (22), wherein the first drive rod (21), the support assembly (25), the third drive rod (23) and the second drive rod (22) are sequentially rotatably connected to form a four-bar linkage mechanism. The turn-up mechanism according to claim 7.

9. The turning-up mechanism further includes a second turning-up structure (30). The first turning-up structure (20) and the second turning-up structure (30) respectively turn up and roll the side wall (50). The first turning-up structure (20) is provided on the main shaft assembly (10), and the second turning-up structure (30) is provided on one side of the main shaft assembly (10). The turning-up mechanism according to claim 4 is characterized in that.

10. The second turning-up structure (30) includes two suspension arms that are symmetrically spaced apart and a turning-up space is formed between them, and a third drive assembly connected to the two suspension arms and driving the two suspension arms to move simultaneously to roll the side walls (50) on both sides of the tire. The turning-up mechanism according to claim 9 is characterized in that.

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