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, specifically to a turn - up method and a turn - up mechanism.

Background Art

[0003] When turning up and molding an existing tire, mainly a bladder drum is 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 the mechanical drum. Therefore, the defective rate of the tire is high and the cost remains high.

[0004] In the case of a mechanical drum, the cost is low, but when rolling the sidewall, there are problems such as large rolling pressure and easy indentation remaining, or small rolling pressure and incomplete bonding of the sidewall. Therefore, even though the cost is lower than that of the 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 prior art that the bonding quality of the sidewall of the tire is poor.

Means for Solving the Problems

[0006] To achieve the above objective, according to one selectable embodiment of the present application, a turn-up method is provided for rolling a sidewall radially in a tire using a rolling roller assembly, the turn-up method comprising: step S1, a limiting device applying pressure within a first predetermined range to the rolling roller assembly so that the rolling roller assembly moves outward along the radial direction of the tire and contacts the sidewall, thereby bonding the sidewall to the side surface of the tire blank; and step S2, the limiting device applying pressure within a second predetermined range to the rolling roller assembly so that the rolling roller assembly moves inward along the radial direction of the tire, wherein the pressure within the first predetermined range is smaller than the pressure within the second predetermined range.

[0007] In one selectable embodiment, the turn-up method further includes step S3 after performing step S2, in which a second turn-up structure applies pressure to the sidewall to bond the sidewall to the side of the tire blank, and the second turn-up structure rolls both sides of the tire blank simultaneously.

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

[0009] According to one selectable embodiment of the present application, a turn-up mechanism is provided on a spindle assembly, the turn-up mechanism comprising a plurality of first turn-up structures provided circumferentially on the spindle assembly, the turn-up mechanism used to carry out the turn-up method, the first turn-up structure comprising a rolling roller assembly provided on one side of a tire for rolling the sidewall of the tire, a rolling device driven and connected to the rolling roller assembly for driving the rolling roller assembly to move radially on the tire, and a limiting device driven and connected to the rolling roller assembly for applying a force to move the rolling roller assembly toward the tire when the tire is rotating.

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

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

[0012] In one selectable embodiment, the first turn-up structure is connected to a first drive rod and further includes a support assembly for supporting the outer sidewalls of the turn-up mechanism, and the rolling roller assembly is rotatably mounted 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, one end of which is rotatably connected to a support assembly and the other end of which is rotatably connected to a second drive rod, wherein the first drive rod, support assembly, third drive rod and second drive rod are sequentially rotatably connected to form a four-bar linkage mechanism.

[0014] In one selectable embodiment, the turn-up mechanism further comprises a second turn-up structure, the first and second turn-up structures respectively turn up and compact the sidewall at different positions, the first turn-up structure being located on the inside of the tire and compacting the sidewall at the edge closer to the center of the tire, and the second turn-up structure being located on the outside of the tire and compacting the sidewall at the edge closer to the tire tread.

[0015] In one selectable embodiment, the second turn-up mechanism includes two suspension arms, which are symmetrically spaced apart and between which a turn-up space is formed, and a third drive assembly connected to the two suspension arms, which drives and moves the two suspension arms simultaneously to compact the sidewalls on both sides of the tire.

[0016] The turn-up method to which the technical solution of this application is applied rolls the sidewall of the tire radially using a rolling roller assembly. Specifically, the turn-up method includes steps S1 and S2. In step S1, the rolling roller assembly moves outward along the radial direction of the tire. At this time, the rotational speed of the tire's spindle assembly is low, and the centrifugal force generated by the rolling roller assembly is small. Therefore, the control device applies pressure within a first predetermined range to the rolling roller assembly to cause it to contact the sidewall. In step S2, the rolling roller assembly moves inward along the radial direction of the tire. At this time, the rotational speed of the tire's spindle assembly is high, and the centrifugal force generated by the rolling roller assembly is large. Therefore, if a large amount of pressure is not applied to the rolling roller assembly, it may fly out and, as a result, be unable to return to its original position. For this reason, the limiting device applies pressure within a second predetermined range to the rolling roller assembly to allow it to return smoothly. At this time, the pressure value within the first predetermined range is smaller than the pressure value within the second predetermined range. Through the above operation, the pressure is controlled on a periodic and step-by-step basis, and the force with which the rolling roller assembly presses against the sidewall is always controlled within a predetermined range, thereby avoiding problems of indentation and incomplete bonding of the sidewall. [Brief explanation of the drawing]

[0017] The drawings accompanying the specification, which constitute part of this application, are used to provide a further understanding of this application, and the exemplary embodiments and descriptions herein are interpretable but do not constitute an inappropriate limitation to this application. The accompanying drawings are as follows: [Figure 1] This is a schematic diagram showing the structure of an embodiment of the mechanical drum according to this application. [Figure 2] This is a schematic diagram showing a part of the structure of an embodiment of the turn-up mechanism according to this application. [Modes for carrying out the invention]

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

[0019] To address the problem of poor quality in the bonding of tire sidewalls, which is a problem in the prior art, this application provides a turn-up method and a turn-up structure.

[0020] When a machine drum uses a rolling roller assembly 201 to turn up and roll up the sidewall of a tire, the biggest drawback is as follows: The rolling roller assembly 201 tends to leave indentations during the rolling process of the tread, affecting the quality and appearance of the tire. However, if the pressure applied to the tread is low, the rolling roller assembly 201 cannot adhere to the sidewall due to the centrifugal force during the high-speed rotation of the spindle assembly 10. As a result, the sidewall and the tire blank cannot be completely bonded. To solve the above problem, the turn-up method of this application uses a rolling roller assembly 201 to roll up the sidewall in the radial direction of the tire. Referring to Figures 1 and 2, the turn-up method specifically includes steps S1 and S2, in which step S1, the rolling roller assembly 201 moves outward along the radial direction of the tire. At this time, the rotational speed of the spindle assembly 10 of the tire is low, and the centrifugal force generated by the rolling roller assembly 201 is small, preventing the rolling roller assembly 201 from creating indentations when rolling up the sidewall. To avoid problems such as the tire blank becoming immobile due to excessive pressure from the rolling roller assembly 201, the control device in this application applies pressure within a first predetermined range to the rolling roller assembly 201, causing it to contact 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 rotational speed of the tire's main shaft assembly 10 is high, and the centrifugal force generated by the rolling roller assembly 201 is large. If a large amount of pressure is not applied to the rolling roller assembly 201, it may fly out and, as a result, be unable to return to its original position. Therefore, the limiting device applies pressure within a second predetermined range to the rolling roller assembly 201 in order to allow the rolling roller assembly 201 to return smoothly when the tire rotates at high speed and to enable the support assembly to return to its original position. At this time, the pressure value within the first predetermined range is smaller than the pressure value within the second predetermined range.Through the above operation, the pressure is controlled on a periodic and stepwise basis, and the force with which the rolling roller assembly 201 presses against the sidewall is always controlled within a predetermined range, thereby avoiding problems of indentation and incomplete bonding of the sidewall.

[0021] Furthermore, the following situation exists in the turn-up method of this application: The rotational speed of the spindle assembly is always the same during the turn-up process, or the rotational speed of the spindle assembly when the rolling roller assembly moves outward is greater than the rotational speed of the spindle assembly when the rolling roller assembly moves inward. In this case, the limiting device of this application, assuming that it can overcome centrifugal force, applies a small force to the rolling roller assembly when it moves outward, but applies a large force to the rolling roller assembly when it moves inward. The purpose of this is to first apply a small force during the process of the rolling roller assembly moving outward to bond the sidewall to the side of the tire blank, and then apply a large force to the rolling roller assembly during the process of the rolling roller assembly returning to its inward position to flatten the sidewall and bond it tightly to the tire blank, while simultaneously preventing indentations as much as possible. In other words, the limiting device of this application applies a small force to the rolling roller assembly when it moves outward during the turn-up process, regardless of the rotational speed of the spindle assembly, in order to bond the sidewall to the side of the tire blank, and further applies a large force to the rolling roller assembly when it moves inward, in order to flatten the sidewall and bond it tightly to the tire blank.

[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, there is a problem that the current sidewall has incomplete adhesion to 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 with the reverse principle.

[0024] This application further provides a turn-up mechanism for carrying out the above-described turn-up method, the turn-up mechanism being provided on a spindle assembly 10. The turn-up mechanism comprises a plurality of first turn-up structures 20 provided circumferentially on the spindle assembly 10. The first turn-up structure 20 includes a rolling roller assembly 201 for rolling the sidewall of a tire, a first drive rod 21 driven to the rolling roller assembly 201, a first drive assembly 211 connected to the first drive rod 21 for driving the rolling roller assembly 201 by the first drive rod 21 to move it radially toward the tire, and a limiting device driven to the rolling roller assembly 201 for applying a force to move the rolling roller assembly 201 toward the tire when the tire rotates.

[0025] The turning-up mechanism of the present application includes a plurality of first turning-up mechanisms 20. The plurality of first turning-up structures 20 are provided in the circumferential direction of the main shaft assembly 10. The first turning-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 turning-up structure further includes a support assembly and a second driving assembly 221. The rolling roller assembly 201 abuts directly against the sidewall 50 to roll and press the sidewall 50 of the tire, and is thus 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, thereby moving 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 moving process and maintains 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 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] Furthermore, the rolling roller assembly 201 of this application is provided on a support assembly 25. According to one embodiment, the rolling roller assembly 201 includes a roller or a rolling roller, the roller being rotatably mounted at the end of the support assembly 25 near the sidewall 50. A second drive assembly 221 can directly press against the sidewall 50 by pushing the rolling roller assembly 201. According to a second embodiment, the second drive assembly 221 pushes a first drive rod 21, which is connected to the end of the support assembly 25 near the rolling roller assembly 201, and further pushes the rolling roller assembly 201 to press against the sidewall 50. According to the third embodiment, as shown in Figure 2, the roller is rotatably mounted at the end of the support assembly 25 closest to the sidewall 50, the end of the support assembly 25 closest to the rolling roller assembly 201 is rotatably connected to the first drive rod 21, and 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 rollers of the rolling roller assembly 201, respectively, causing the rollers to press against the sidewall 50.

[0027] After being lifted, the support assembly 25 can better support the sidewall 50 in shape because the end perpendicular to the tire sidewall 50 or the end away from the tire is at an upward-sloping angle, effectively preventing the sidewall 50 from being pressed against the rollers on the rolling roller assembly 201 and sticking to the tire blank. However, after the turn-up rod is pulled back, the portion of the sidewall 50 away from the rollers on the rolling roller assembly 201 may develop a groove in the portion of the sidewall 50 closer to the tire after it has been turned up due to the contraction of the rubber material, and wrinkles may occur when the suspension arm is later pressed into the groove. Therefore, in this application, by providing the rollers on the rolling roller assembly 201 at the end of the support assembly 25 that is located on the sidewall 50, 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, and when the suspension arm later rolls, it continues to roll following the rolling position of the rolling roller assembly 201, so that the sidewall 50 is not pressed and wrinkles do not occur.

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

[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 which is rotatably connected to the first drive rod 21 and used to push up and swing the first drive rod 21. One end of the third drive rod 23 is rotatably connected to the 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 and rotate the first drive rod 21 and the third drive rod 23 simultaneously. The first drive rod 21 and the third drive rod 23 rotate simultaneously to move and lift the upper support assembly 25 to support the unrolled sidewall 50. 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 enable the movement of the rolling roller assembly 201 along the side of the tire blank, a fourth drive rod 24 is also provided in the first turn-up structure 20 of this 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 is driven to rotate the first drive rod 21 by the fourth drive rod 24. The first drive assembly 211 employs a cylinder, which is provided in the spindle assembly 10. The fourth drive rod 24 is provided to be axially movable in the spindle assembly 10, and when operating, the cylinder pushes the fourth drive rod 24, causing it to move axially in 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, causing it to oscillate and press the rolling roller assembly 201 against the sidewall 50, causing it to slide. The oscillating motion reduces the problem of the rolling roller assembly 201 becoming immobile when it comes into contact with a recess or protrusion in the sidewall 50.

[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 the portion of the first drive rod 21 between the support assembly 25 and the fourth drive rod 24, and the rolling roller assembly 201 is provided at the end of the first drive rod 21 closer to the support assembly 25 or at the end of the support assembly 25 closer to the sidewall 50.

[0032] In this embodiment, by setting the connection positions between the fourth drive rod 24, the second drive rod 22, and 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 hinged to the first drive rod 21, and the other end of the second drive rod 22 is hinged to the second drive assembly 221. Here, the third drive rod 23 is hinged to the portion of the second drive rod 22 between the first drive rod 21 and the second drive assembly 221.

[0033] To support the unbonded portion of the sidewall 50, the support assembly 25 of this application is provided with a plurality of support rods. The plurality of support rods are spaced apart perpendicular to the sidewall 50 and 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, the drums being rotatably fitted onto the support rods so that the sidewall 50 slides.

[0034] In order for the rolling roller assembly 201 to better and smoothly compact the sidewall 50, the rolling roller assembly 201 is rotatably mounted on the first drive rod 21 or the support assembly 25. Specifically, the rolling roller assembly 201 includes annular rolling rollers, the rolling rollers being mounted at the end of the first drive rod 21, or the rolling rollers being fitted onto a support rod near one end of the sidewall 50 of the support assembly 25.

[0035] Furthermore, in order to reduce the overall space required for the turn-up mechanism, the stroke of the first turn-up structure 20 is limited in this embodiment, and a two-stage turn-up configuration is adopted. Specifically, the turn-up mechanism further comprises a second turn-up structure 30, with the first turn-up structure 20 located on the inside of the tire and the second turn-up structure 30 located on the outside of the tire. The first turn-up structure 20 and the second turn-up structure 30 turn up and compact different positions of the sidewall 50, respectively. The portion of the tire blank's side closer to the center of the tire is compacted and bonded by the first turn-up structure 20, while the portion of the tire blank's side closer to the outside of the tire is compacted and bonded by the second turn-up structure 30.

[0036] The second turn-up structure 30 includes two suspension arms and a third drive assembly, the two suspension arms being symmetrically spaced apart. The two suspension arms may be positioned closer together or further apart, forming a turn-up space between them. When they are close together, the ends of the suspension arms press against the sidewall 50, and the compaction presses the sidewall 50 against the side of the tire blank. The third drive assembly is connected to the two suspension arms, and the third drive assembly employs a cylinder to simultaneously drive and move the two suspension arms, compacting the sidewalls 50 on both sides of the tire.

[0037] This application further provides a mechanical drum comprising a spindle assembly 10 and two turn-up mechanisms. The two turn-up mechanisms are provided symmetrically on the spindle assembly 10. The two turn-up structures each roll up the sidewalls on both sides of the tire. The turn-up mechanisms are the turn-up mechanisms described above. This mechanical drum abandons the existing bladder turn-up configuration and forms the rolling of the sidewalls 50 by a cylinder, link mechanism and rolling roller assembly 201, thus providing a longer service life and cost savings.

[0038] Furthermore, the machine drum of this application further comprises a lock ring structure 40. There are two lock ring structures 40, which are provided symmetrically on the spindle assembly and located between two turn-up mechanisms, and are used to lock the tire bead and secure the tire blank.

[0039] From the above description, it can be seen that the above embodiment of this application achieves the following technical effects. The turn-up mechanism described in this application provides adjustment and control over the pressure of the rolling roller assembly. Specifically, the limiting cylinder adjusts the pressure to be low when the rolling roller moves upward along the sidewall, and adjusts the pressure to be high when the rolling roller moves downward along the sidewall. When the suspension arm engages, the drum rotates at high speed, the centrifugal force is large, and the pressure in the cylinder is also large at this time.

[0040] In the conventional turn-up process of a machine drum, if the pressure in the limiting cylinder is too high when the rolling roller assembly is facing upwards, the rolling roller assembly cannot rise, so the pressure needs to be reduced at this time. If the pressure is too high at this time, the indentation on the sidewall will be deep, affecting the quality, and when pulling it back, the pressure needs to be increased in order for the rolling roller assembly to return to its original position overcoming centrifugal force.

[0041] The foregoing describes preferred embodiments of this application and is not intended to limit it. Those skilled in the art can make various changes and modifications to this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within its scope. [Explanation of Symbols]

[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 Sidewall

Claims

1. A turn-up method for rolling a tire sidewall (50) radially using a rolling roller assembly (201), The limiting device includes step S1, which applies pressure within a first predetermined range to the rolling roller assembly (201) so that as the rolling roller assembly (201) moves outward along the radial direction of the tire, it comes into contact with the sidewall (50) and bonds the sidewall (50) to the side surface of the tire blank; The limiting device includes step S2 of applying pressure within a second predetermined range to the rolling roller assembly (201) in order to move the rolling roller assembly (201) inward along the radial direction of the tire and flatten the sidewall (50) so that it adheres tightly to the tire blank, A turn-up method characterized in that the pressure value within the first planned range is smaller than the pressure value within the second planned range.

2. The turn-up method further includes step S3 after performing step S2, The turn-up method according to claim 1, characterized in that in step S3, the second turn-up structure (30) applies pressure to the sidewall (50) to bond the sidewall (50) to the side surface of the tire blank, and the second turn-up structure (30) simultaneously rolls pressure on both sides of the tire blank.

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

4. A turn-up mechanism comprising a plurality of first turn-up structures (20) provided on a spindle assembly (10) and provided in the circumferential direction of the spindle assembly (10), wherein the turn-up mechanism is used to carry out the turn-up method described in any one of claims 1 to 3, and the first turn-up structures (20) are A rolling roller assembly (201) is provided on one side of the tire for rolling the tire sidewall (50), A compaction device is connected to the rolling roller assembly (201) for driving the rolling roller assembly (201) to move it in the radial direction of the tire, A turn-up mechanism comprising a limiting device that is driven to the rolling roller assembly (201) and applies a force to the rolling roller assembly (201) to move the tire when the tire rotates.

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

6. The limiting device is, The turn-up mechanism according to claim 5, further 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 outer sidewall (50) of the turn-up mechanism, wherein the rolling roller assembly (201) is rotatably mounted on the support assembly (25) or the first drive rod (21).

8. The first turn-up structure (20) is, The system further includes a third drive rod (23) whose one end is rotatably connected to the support assembly (25) and whose other end is rotatably connected to the second drive rod (22), The turn-up mechanism according to claim 7, characterized in that 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.

9. The turn-up mechanism according to claim 4, further comprising a second turn-up structure (30), wherein the first turn-up structure (20) and the second turn-up structure (30) each turn up and compact the sidewall (50), the first turn-up structure (20) is provided on the spindle assembly (10), and the second turn-up structure (30) is provided on one side of the spindle assembly (10).

10. The aforementioned second turn-up structure (30) is Two suspension arms are provided symmetrically spaced apart, with a turn-up space formed between them, The turn-up mechanism according to claim 9, further comprising a third drive assembly connected to two of the suspension arms for simultaneously driving and moving the two suspension arms and compacting the sidewalls (50) on both sides of the tire.

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