A bead lock device

Abstract

The present application relates to tire forming technology field, especially a kind of bead lock ring device, including cylinder, fixedly arranged in the outer periphery of cylinder, for the lock ring assembly for fixing bead, setting in the one side of lock ring assembly, and along the axial movement of cylinder, for the reverse package assembly for the reverse package of sidewall, lock ring assembly includes the inner shell and outer shell spaced apart along the axial direction and arranged on the outer periphery of cylinder, the outer periphery of cylinder and the position between inner shell and outer shell slidingly arranged with lock ring piston, first chamber is formed between lock ring piston and inner shell, second chamber is formed between lock ring piston and outer shell;It is also formed between inner shell and outer shell with annular installation port of end outward open, the installation port is provided with several lock ring blocks, which are arranged around the circumference and can reciprocate along the radial direction, each lock ring block and lock ring piston are hinged by corresponding lock ring connecting rod each other.The present application solves the problem of unstable force when bead is locked.

Description

Technical Field

[0001] This invention relates to the field of tire forming technology, and in particular to a bead locking device. Background Technology

[0002] Existing tire sidewall wrapping structures generally fall into two categories: bladder-type sidewall wrapping and mechanical sidewall wrapping rod structures. The former offers uniform wrapping height but slow wrapping speed, low pressure from the bladder on the tire sidewall, and poor adhesion between the sidewall and the tire carcass / triangle rubber, making it prone to detachment and quality issues. Furthermore, the wrapping roller easily touches the bladder when pressing it between the sidewall and the bladder, significantly impacting bladder lifespan and increasing tire manufacturing costs. The latter uses metal struts to achieve the sidewall wrapping process. The highest point of the strut is located at the tire shoulder, resulting in excessive height and significant dimensional deformation of the pressure-bearing sidewall area. This leads to a circumferential wavy shape on the sidewall edge after tire blank formation, significantly affecting the uniformity of tire dynamic balance.

[0003] Chinese invention patent application (CN113681957A, publication date: 2021.11.23) discloses a mechanical drum suspension reverse wrapping forming structure, including a main shaft assembly and a rear press. The rear press is arranged opposite to the main shaft assembly. The mechanical drum suspension reverse wrapping forming structure also includes a locking ring assembly and a reverse wrapping assembly disposed on the main shaft assembly. There are two reverse wrapping assemblies, which are symmetrically arranged on both sides of the locking ring assembly. The reverse wrapping assembly includes: multiple reverse wrapping structures, which are circumferentially spaced around the main shaft assembly and have a supporting position and a retracted position; multiple support plates, which correspond one-to-one with the multiple reverse wrapping structures and are disposed on the corresponding reverse wrapping structures; and a first drive assembly, which is disposed on the main shaft assembly and is drivenly connected to the multiple reverse wrapping structures. During the process of the reverse wrapping structure moving from the supporting position to the retracted position, the suspension arm of the rear press can extend between the tire sidewall and the reverse wrapping structure and drive the tire sidewall to move away from the reverse wrapping structure.

[0004] The patent has the following problems:

[0005] 1. The bead locking assembly is mainly used to lock the tire bead, ensuring that its position does not move after locking, thus facilitating tire carcass molding. To achieve this locking, a radial expansion method of the bead locking blocks is typically used. During locking, the bead locking blocks move radially outward, providing a radial expansion force to the inner circumference of the bead and locking it in place. Therefore, how the bead locking blocks move to ensure sufficient locking force is crucial. However, current bead locking block drive methods cannot guarantee stable radial tension at each position, resulting in varying locking forces at different locations during bead locking, affecting tire carcass quality.

[0006] 2. When the support plate is in the support position, the tire sidewall is stretched due to the support plate. However, uncured rubber has a certain elasticity. When the support plate returns to the retracted position from the support position, the tire sidewall that was not pressed by the reverse wrapping structure will spring back, causing the tire sidewall to fold. At this time, the rear pressure roller of the rear press truck will not be able to extend between the rebounded tire sidewall and the reverse wrapping structure, thus making it impossible to press the rebounded tire sidewall. Summary of the Invention

[0007] To address the technical problem of the aforementioned bead locking assembly affecting the quality of the tire carcass, the present invention aims to provide a bead locking device. This device utilizes an axially reciprocating bead locking piston positioned between the inner and outer shells, and a bead locking block that reciprocates radially via a bead locking rod, thereby locking the tire bead and ensuring stable radial tension at all points on the tire bead.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A bead-locking device includes a cylindrical body, a bead-locking assembly fixedly disposed on the outer periphery of the cylindrical body for securing the bead, and a wrapping assembly disposed on one side of the bead-locking assembly and moving axially along the cylindrical body for wrapping the tire sidewall. The bead-locking assembly includes an inner shell and an outer shell spaced axially on the outer periphery of the cylindrical body. A bead-locking piston is slidably disposed on the outer periphery of the cylindrical body between the inner shell and the outer shell. A first chamber is formed between the bead-locking piston and the inner shell, and a second chamber is formed between the bead-locking piston and the outer shell. By controlling the pressure in the first and second chambers, the bead-locking piston reciprocates between the inner shell and the outer shell. An annular mounting port with an outwardly open end is also formed between the inner shell and the outer shell. Several bead-locking blocks are arranged circumferentially and can reciprocate radially within the mounting port. Each bead-locking block is hinged to the bead-locking piston via a corresponding bead-locking connecting rod, so that when the bead-locking piston reciprocates axially on the cylindrical body, it drives each bead-locking block to reciprocate radially within the mounting port.

[0010] Preferably, the locking ring piston moves axially on the cylinder, thereby having a first working position and a second working position. When the locking ring piston is in the first working position, the end of the locking ring piston abuts against the inner wall of the inner shell. When the locking ring piston is in the second working position, the end of the locking ring piston abuts against the inner wall of the outer shell.

[0011] Preferably, the inner housing includes a first end cover and a first peripheral wall, and the radially outer end of the locking ring piston abuts against the first peripheral wall, thereby forming the first chamber between the first end cover and the locking ring piston, and when the locking ring piston is in the first working position, the end of the locking ring piston abuts against the first end cover.

[0012] The outer casing includes a second end cap and a second peripheral wall. The radially outer end of the locking ring piston abuts against the second peripheral wall, thereby forming the second chamber between the second end cap and the locking ring piston. When the locking ring piston is in the second working position, the end of the locking ring piston abuts against the second end cap.

[0013] Preferably, a first ring extending circumferentially is formed on the outer periphery of the inner shell, and a second ring extending circumferentially is formed on the outer periphery of the outer shell. The first and second rings face each other and are spaced apart, thereby forming the mounting opening between them.

[0014] Preferably, the inner wall of the first ring body and / or the second ring body facing the mounting port is provided with a radially extending guide strip, and the locking ring block is provided with a guide groove corresponding to the guide strip, the guide groove fitting inside the guide strip.

[0015] Preferably, the outer surface of the cylinder is provided with a first air inlet / outlet hole communicating with the first chamber and a second air inlet / outlet hole communicating with the second chamber. The inside of the cylinder is provided with a first air inlet / outlet channel communicating with the first air inlet / outlet hole and a second air inlet / outlet channel communicating with the second air inlet / outlet hole. The pressure change of the first chamber and the second chamber is realized by opening and closing the first air inlet / outlet hole and the second air inlet / outlet hole.

[0016] Preferably, the locking ring piston is provided with multiple mounting seats in the circumferential direction, the lower end of the locking ring connecting rod is hinged to the mounting seat, and the upper end of the locking ring connecting rod is hinged to the locking ring block.

[0017] Preferably, the locking ring block includes a first locking ring block and a second locking ring block, which are arranged alternately in the circumferential direction. When the locking ring block expands radially outward, the first locking ring block and the second locking ring block are located on the same circumference, and their boundaries abut without gaps. When the locking ring block contracts radially inward, the first locking ring block and the second locking ring block are located on different circumferences and are misaligned with each other.

[0018] Preferably, the arc length of the first locking ring block is greater than that of the second locking ring block, and the boundary lines of the first locking ring block and the boundary lines of the second locking ring block are mutually compatible oblique lines.

[0019] Preferably, the reverse wrapping assembly moves axially along the cylinder under the drive of the first drive assembly, thus having a support position and a retracted position. During the process from the retracted position to the support position, the reverse wrapping assembly reverses the tire sidewall. The reverse wrapping assembly includes a support plate, which moves radially outward along the cylinder during the process from the retracted position to the support position, providing a support platform for the tire sidewall. In the support position, the angle between the support plate and the horizontal plane is 10~20°.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting mutually spaced inner and outer shells, the axial movement stroke of the locking ring piston and the radial movement guide of the locking ring block are defined. A locking ring connecting rod is provided between the locking ring piston and the locking ring block, so that the locking ring piston can correspondingly drive the locking ring block to move when moving axially, thereby achieving tire bead locking. Furthermore, this locking structure ensures that the tire bead is subjected to a stable locking force at all points. In addition, by limiting the two working positions of the locking ring piston to the inner walls of the inner and outer shells respectively, the position of the locking ring piston is the same each time it is locked, thus ensuring that the position of the locking ring block is also the same, thereby guaranteeing the consistency of the quality of each tire blank. Moreover, the locking ring block is divided into two parts, one large and one small, which facilitates the expansion and contraction of the locking ring block, making the locking ring movement easier to achieve and control. Attached Figure Description

[0021] Figure 1 This is a perspective view of the tire forming device of a tire forming machine.

[0022] Figure 2 This is an exploded view of the tire forming device of a tire forming machine. The exploded view includes the main shaft assembly, the first forming drum, and the second forming drum.

[0023] Figure 3 This is an exploded view of the spindle assembly.

[0024] Figure 4 This is a schematic diagram of the first molded drum.

[0025] Figure 5 This is a schematic diagram with the locking ring assembly and the second drive assembly on the first forming drum hidden, i.e., only the cylinder, the reverse wrapping assembly, and the first drive assembly are shown.

[0026] Figure 6 This is an exploded view of the cylinder, the reverse wrapping assembly, and the first drive assembly.

[0027] Figure 7 This is a three-dimensional view of the first molded drum after it has been cut open by a longitudinal plane passing through the center line of the cylinder.

[0028] Figure 8 This is a cross-sectional view of the cylinder, showing the gas passages inside the cylinder.

[0029] Figure 9 This is a schematic diagram showing the second drive component disassembled within the first molding drum.

[0030] Figure 10 This is a three-dimensional view of the first molded drum after it has been cut open by a longitudinal plane passing through the center line of the cylinder.

[0031] Figure 11 This is an exploded view of the locking ring assembly.

[0032] Figure 12 This is a schematic diagram of the lock ring assembly cut longitudinally.

[0033] Figure 13 This is a schematic diagram of the locking ring piston and locking ring block.

[0034] Figure 14 This is a schematic diagram showing the support plate in the retracted position of the inverted assembly during the tire forming process.

[0035] Figure 15 This is a schematic diagram showing the support plate in the inverted wrapping assembly in the support position during the tire forming process. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] A tire forming machine is a specialized piece of equipment used in tire manufacturing to assemble semi-finished components (such as tread, sidewall, crown, carcass, and bead) into a tire blank according to process requirements. The tire forming machine includes a tire forming device at the front end, several conveyor devices at the rear end for transporting different semi-finished products, and a rear pressing device above the tire forming device. The rear pressing device further rolls the tire sidewall during the sidewall wrapping action of the tire forming device. The structure of the rear pressing device can be found in Chinese invention patent application CN113681957A.

[0038] Figure 1 A schematic diagram of the tire forming apparatus in this embodiment is shown. The tire forming apparatus includes a main shaft assembly 10, which is located at the center of the apparatus, has a long cylindrical shape, and its axis extends horizontally to the left and right. It also includes two first forming drums 20 and second forming drums, which are distributed on the outer periphery of the main shaft assembly 10 and can rotate synchronously around the main shaft assembly 10. The first forming drum 20 and the second forming drum are both cylindrical in shape and are symmetrical to the left and right, respectively used to form one side of the tire blank.

[0039] During tire blank forming, the ends of the multiple layers of rubber material constituting the tire blank are respectively connected to the tire forming device via their respective conveying devices. Specifically, the right end of each layer of rubber material is connected to the first forming drum 20, and the left end of each layer of rubber material is connected to the second forming drum. Then, the main shaft assembly 10 drives the first forming drum 20 and the second forming drum to rotate at high speed, so that the rubber material is quickly wrapped around the outer surface of the first forming drum 20 and the second forming drum. After the wrapping is completed, the rubber material is in the shape of a ring with the left and right ends spanning between the first forming drum 20 and the second forming drum, and the interior of the rubber material forms a closed cavity. At this time, the main shaft assembly 10 inflates the area inside the rubber material, so that the rubber material expands radially outward, initially forming the tire blank. At the same time, the first forming drum 20 and the second forming drum reverse the position of the tire sidewall near the radial inner side of the tire blank, so that the tire sidewall wraps around the tire bead and adheres to the outer surface of the tire body and extends radially outward again. After the tire sidewall is initially reversed, the rear pressing device rolls the unreverse tire sidewall until the tire sidewall is completely adhered to the tire body, completing the tire forming process.

[0040] Since the structures of the first forming drum 20 and the second forming drum are symmetrical, the first forming drum 20 will be used as an example in the following text to illustrate the specific structure of the two forming drums. The structure of the second forming drum will not be described in detail.

[0041] like Figure 2 As shown, in order to enable the spindle assembly 10 to drive the first forming drum 20 and the second forming drum to rotate around the circumference, the following structure is adopted: The spindle assembly 10 includes a transversely arranged long rod-shaped spindle 11. The outer surface of the spindle 11 is a smooth and flat cylindrical surface, and a first protrusion 113 and a second protrusion 114 are provided on the cylindrical surface. The first protrusion 113 is relatively close to the right end of the spindle 11, and the second protrusion 114 is relatively close to the left end of the spindle 11. Both the first protrusion 113 and the second protrusion 114 protrude outward along the radial direction of the spindle 11, thereby forming a protrusion on the outer surface of the spindle 11. Corresponding to the protrusion, the first forming drum 20 and the second forming drum are respectively provided with a first connecting hole 211 and a second connecting hole (not shown due to viewing angle, refer to the first connecting hole 211). The first connecting hole 211 cooperates with the first protrusion 113, and the second connecting hole cooperates with the second protrusion 114. More precisely, the radial outer end of the first protrusion 113 is inserted into the first connecting hole 211, and the radial outer end of the second protrusion 114 is inserted into the second connecting hole. Thus, when the external drive source drives the spindle 11 to rotate, the first protrusion 113 and the second protrusion 114 will respectively drive the first forming drum 20 and the second forming drum to rotate circumferentially.

[0042] It should be noted that the number of the first protrusion 113 and the second protrusion 114 can be varied. For example, in this embodiment, there are two of each of the first protrusion 113 and the second protrusion 114 (there are also two of the corresponding first through groove 111 and second through groove 112), and they are arranged radially opposite to each other on the outer surface of the main shaft 11. This not only improves the connection strength between the main shaft 11 and the forming drum, but also balances the centrifugal force when the forming drum rotates, ensuring smooth rotation.

[0043] Furthermore, it is noted that tires of different specifications often have different widths. In the tire forming process, this is mainly reflected in the different distances between the left and right bead sections; for the tire forming device, this translates to a different axial distance between the first forming drum 20 and the second forming drum. Therefore, when producing tires of different specifications, it is also necessary to adjust the axial distance between the first forming drum 20 and the second forming drum on the main shaft 11. For this purpose, as follows... Figure 3 As shown, the spindle 11 has a hollow structure inside. The outer surface of the spindle 11 has a first through groove 111 and a second through groove 112 that connect the internal cavities. The first through groove 111 is relatively close to the right side of the spindle 11, and the second through groove is relatively close to the left side of the spindle 11. Both the first through groove 111 and the second through groove 112 extend along the axis of the spindle 11, thus forming a long strip. The first protrusion 113 mentioned above is slidably disposed in the first through groove 111, and the second protrusion 114 is slidably disposed in the second through groove 112. To drive the first protrusion 113 and the second protrusion 114 to move axially within the first through groove 111 and the second through groove 112 respectively, a lead screw 12 is concentrically disposed inside the main shaft 11. The two ends of the lead screw 12 extend to the positions of the first through groove 111 and the second through groove 112 respectively, and the threads on the left and right sides of the lead screw 12 rotate in opposite directions. A first nut 13 and a second nut 14 are rotatably disposed on the outer periphery of the right and left sides of the lead screw 12 via threaded connections, respectively. The first nut 13 is fixed to the first protrusion 113. The second nut 14 is fixedly connected to the second protrusion 114. When the lead screw 12 rotates, the first nut 13 drives the first protrusion 113 to move axially in the first through groove 111, and the second nut 14 drives the second protrusion 114 to move axially in the second through groove 112. Since the threads on the left and right sides of the lead screw 12 rotate in opposite directions, the first nut 13 and the second nut 14 either approach each other at the same speed or move away from each other at the same speed. Consequently, the first protrusion 113 and the second protrusion 114 also move closer or further away from each other, causing the first forming drum 20 and the second forming drum to move axially on the main shaft 11 accordingly, adjusting the distance between them.

[0044] The main shaft assembly 10 is used as follows: When it is necessary to increase the axial distance between the left and right tire bead groups, the lead screw 12 is rotated by a drive element such as a motor, causing the first lead screw nut 13 and the second lead screw nut 14 to move in opposite directions along the axial direction of the lead screw 12 towards the outer end of the main shaft 11. Consequently, the first protrusion 113 and the second protrusion 114 move axially outward within the first through groove 111 and the second through groove 112, respectively. This ultimately causes the first forming drum 20 and the second forming drum to move axially away from each other on the main shaft 11, increasing the axial distance between them. Conversely, when the drive element drives the lead screw 12 to rotate in the opposite direction, the axial distance between the first forming drum 20 and the second forming drum can be reduced.

[0045] As one way to fix the connection between the nut and the bump, such as Figure 3 As shown, an annular fixing sleeve 15 is fitted around the outer circumference of the first nut 13. The right end face of the fixing sleeve 15 is fixedly connected to the flange face of the right end of the first nut 13 by bolts. Multiple mounting grooves 151 are evenly arranged on the outer circumference of the fixing sleeve 15, each groove 151 containing a threaded hole. The first protrusion 113 mentioned above has a radially extending through hole for the bolt to pass through. Thus, the first protrusion 113 can be fixedly mounted in one of the mounting grooves 151 by bolts, thereby achieving relative fixation between the first protrusion 113 and the first nut 13. This ensures that when the lead screw 12 rotates, the first nut 13 and the first protrusion 113 can move axially along the guide of the first through groove 111. The connection relationship between the second nut 14 and the second protrusion 114 is the same as described above and will not be repeated here.

[0046] As mentioned earlier, tire forming also requires air blowing. Therefore, such as Figure 3 As shown, an air blowing hole 116 is provided on the outer surface of the middle part of the main shaft 11. In this embodiment, there are two air blowing holes 116. Figure 3 Due to the viewing angle, only the air inlet facing the observer is shown. These are located at two radially opposite ends on the outer surface of the main shaft 11 to achieve rapid and uniform inflation of the tire blank. An air inlet flange 117 for connecting to an external air source is provided at the right end of the main shaft 11. The air inlet 116 and the air inlet flange 117 are connected via an air passage (not shown) located inside the main shaft 11. When inflation of the tire blank is required, an external air source (e.g., an air tank) supplies air to the air inlet flange 117, thereby compressing air into the air passage and finally blowing it out from the air inlet 116. This causes the rubber layers constituting the tire blank to expand radially outward, achieving the initial forming of the tire blank.

[0047] Having clarified the structure of the main shaft 11, the following text will use the axial direction of the main shaft 11 as the axial direction, and the middle part near the axial direction of the main shaft 11 as the inner end, and conversely, the two ends near the axial direction of the main shaft 11 as the outer ends. The diameter direction of the main shaft 11 will be used as the radial direction, and the part near the axis of the main shaft 11 will be the radial inner end (sometimes called the lower end), and conversely, the part away from the axis of the main shaft 11 will be the radial outer end (sometimes called the upper end). The circumferential direction around the main shaft 11 will be used as the circumferential direction.

[0048] Figure 4 A schematic diagram of the first forming drum 20 is shown. The first forming drum 20 includes a cylindrical body 21 disposed at the center of the first forming drum 20 and placed laterally. The cylindrical body 21 is hollow inside and open at both ends. The inner surface of the cylindrical body 21 is axially slidably disposed on the outer surface of the main shaft 11. More precisely, the inner surface of the cylindrical body 21 is a cylindrical surface adapted to the diameter of the outer surface of the main shaft 11, so the cylindrical body 21 can be axially translated on the main shaft 11. The first connecting hole 211 mentioned above is located on the cylindrical body 21 (see...). Figure 6 Thus, when the first protrusion 113 in the spindle assembly 10 moves axially, it will drive the cylinder 21 to move axially on the spindle 11, thereby realizing the overall axial movement of the first forming drum 20 on the spindle 11.

[0049] like Figure 4 As shown, the inner end of the cylinder 21 ( Figure 4 The left end of the tire is fixedly provided with an annular locking ring assembly 22, which is used to fix the position of the tire bead during tire molding, thereby limiting the width of the tire blank.

[0050] like Figure 4 As shown, multiple sets of ( ) are evenly spaced around the outer periphery of the middle part of the cylinder 21 in the circumferential direction. Figure 4 (Only two sets are shown as examples, but there are actually 30-40 sets) The anti-wrapping components 23 are aligned axially, meaning their two ends are on a circumference. Each anti-wrapping component 23 has a supporting position and a retracted position. In the non-working state, the anti-wrapping component 23 is in the retracted position, as shown in the example. Figure 4 As shown in the position; in the working state (specifically when performing the tire sidewall reversal action), the reversal assembly 23, driven by the first drive assembly 24 (described later), moves to the left end along the axial direction of the cylinder 21, switches to the support position, and reverses part of the tire sidewall during the process from the retracted position to the support position, while providing a support platform for the other part of the tire sidewall.

[0051] Figure 14The diagram shows the tire sidewall 30 before it is rolled up and the rolled-up assembly 23 in the retracted position. In this position, the left end of the rolled-up assembly 23 abuts against the right end face of the beadlock assembly 22, and the rolled-up assembly 23 is in a "flat" state. The tire sidewall 30 is not connected to the rolled-up assembly 23.

[0052] Figure 15 A schematic diagram of the reverse wrapping assembly 23 in the supported position is shown. It can be clearly observed that, under the action of the first drive assembly 24, the reverse wrapping assembly 23 moves inward a certain distance along the axial direction of the cylinder 21. During this movement, the reverse wrapping assembly 23 also undergoes radial outward displacement. At this point, the reverse wrapping assembly 23 is in an "upright" state, and its top contacts the bottom of the tire sidewall 30, supporting it from below. As the reverse wrapping assembly 23 gradually moves radially outward, the inner end of the tire sidewall 30 gradually adheres to the tire body 40 (this action is the reverse wrapping). The outer end of the tire sidewall 30 is at least partially in contact with the reverse wrapping assembly 23. That is, in the supported position, the reverse wrapping assembly 23 can also support the unwrapped portion of the tire sidewall 30, preventing it from falling off. This unwrapped portion of the tire sidewall 30 will be reverse wrapped subsequently by the rear pressing device.

[0053] See again Figure 4 The outer end of the reverse wrapping component 23 along its axis ( Figure 4 A first drive assembly 24 is provided at the right end of the cylinder 21. The first drive assembly 24 surrounds the outer periphery of the cylinder 21, and its output end can slide axially on the cylinder 21, thereby driving the lower end of the reverse wrapping assembly 23 connected to the output end to move axially inward and outward on the cylinder 21, realizing the switching between the support position and the retraction position. In addition, a second drive assembly 25 is also provided on the outer periphery of the first drive assembly 24, and the inner end of the second drive assembly 25 ( Figure 4 The left end (which serves as the output end of the second drive assembly 25) is also connected to the reverse wrapping assembly 23. When the reverse wrapping assembly 23 is performing a reverse wrapping action, the second drive assembly 25 limits the reverse wrapping assembly 23 to ensure that the reverse wrapping assembly 23 moves along a predetermined trajectory, thereby allowing the left end of the reverse wrapping assembly 23 to apply the pressure required for reverse wrapping to the tire sidewall. Furthermore, when the reverse wrapping assembly 23 is in the support position, the second drive assembly 25 can keep it in the support position and prevent it from moving.

[0054] Combination Figure 4 , Figure 14 and Figure 15When the first forming drum 20 is in use, one end of the rubber material constituting the tire carcass, such as the bead and carcass, is first connected to the outer periphery of the locking ring assembly 22; then the main shaft 11 drives the cylinder 21 to rotate, thereby causing the aforementioned rubber material to wind around the locking ring assembly 22; then the outer periphery of the locking ring assembly 22 expands radially outward, thereby fixing the end of the rubber material; then the air blowing hole 116 on the main shaft 11 blows air into the inner side of the rubber material, causing the rubber material to expand radially and initially form the outline of the tire carcass (cross-section as shown in the figure). Figure 14 As shown), at this point, the sidewall 30 is still not attached to the tire body 40 and is in a flat state; then, the first drive assembly 24 drives the reverse wrapping assembly 23 to move inward along the axial direction of the cylinder 21, so that the left end of the reverse wrapping assembly 23 is attached to the tire bead position and gradually moves upward along the tire body 40. During this process, the left end of the reverse wrapping assembly 23 will also contact the sidewall 30 to attach the sidewall 30 to the tire body 40, until the reverse wrapping assembly 23 moves to the support position (see...). Figure 15 At this point, the left end of the reverse wrapping component 23 reaches its highest point, and under the action of the second drive component 25, the reverse wrapping component 23 is held in the support position.

[0055] Figure 6 A schematic diagram of the cylinder 21 is shown. The cylinder 21 is a cylindrical part, hollow inside, open at both ends, and has a relatively large axial length. The cylinder 21 serves as the reference for the entire first forming drum 20. The middle of the cylinder 21 has a first annular piston 244, which will serve as the piston of the first drive assembly 24; its specific function will be described in detail later. The right end of the cylinder 21 is provided with the first connecting hole 211 mentioned above, from which... Figure 6 As can be seen, the first connecting hole 211 is a through hole that penetrates the inner and outer walls of the cylinder 21. The right end face of the first connecting hole 211 is defined by the flange 212 installed on the right end of the cylinder 21. Thus, by first removing the flange 212, the cylinder 21 can be easily installed on the outer periphery of the main shaft 11, and the first protrusion 113 can be connected inside the first connecting hole 211. Then, the flange 212 is fixed to the right end of the cylinder 21 with bolts, so that the first protrusion 113 and the first connecting hole 211 can be matched, thereby connecting the cylinder 21 and the main shaft 11 coaxially, so that the cylinder 21 can rotate around the axis of the main shaft 11 and also translate along the axis of the main shaft 11.

[0056] like Figure 4 and Figure 5As shown, each anti-wrapping assembly 23 has the same structure and is aligned axially, differing only in its position on the circumference of the cylinder 21. Each anti-wrapping assembly 23 includes a connecting rod seat 231 disposed on the outer circumference of the cylinder 21 and movable axially inward and outward under the drive of the first driving assembly 24. The connecting rod seat 231 is approximately cuboid in shape, with its length extending axially along the cylinder 21. The inner circumferential surface of the connecting rod seat 231 is slightly curved to fit the circumferential surface. A hinge interface is provided at each of the left and right ends of the connecting rod seat 231. A connecting shaft is rotatably mounted within the hinge interface. The lower ends of the anti-wrapping main rod 232 and the anti-wrapping secondary rod 233 are mounted on the connecting shaft, allowing them to pivot within the hinge interface. In this embodiment, both the anti-wrapping main rod 232 and the anti-wrapping secondary rod 233 are straight rods; however, in other embodiments, curved lines (e.g., arcs, broken lines) may also be used. The upper ends of the reverse wrapping main rod 232 and the reverse wrapping auxiliary rod 233 are also rotatably connected by a shaft to a support plate 234. The length direction of the support plate 234 extends along the axial direction of the cylinder 21, thereby forming a planar four-bar linkage between the connecting rod seat 231, the reverse wrapping main rod 232, the reverse wrapping auxiliary rod 233 and the support plate 234. When the connecting rod seat 231 moves axially on the cylinder 21, the reverse wrapping main rod 232 and the reverse wrapping auxiliary rod 233 will swing around their respective lower ends, thereby causing the support plate 234 to be raised or lowered. When the support plate 234 is raised, it is in the supporting position; when the support plate 234 is lowered, it is in the retracted position. A reverse-wrapping pressure roller 235 is rotatably installed on the left end of the support plate 234 (which can also be considered as the position facing the tire sidewall). During the process of the reverse-wrapping main rod 232 and the reverse-wrapping auxiliary rod 233 being supported upward, the left end of the reverse-wrapping pressure roller 235 will abut against the tire sidewall. As the supporting angle gradually increases, the reverse-wrapping pressure roller 235 will gradually roll outward along the radial direction of the tire sidewall, thereby adhering the tire sidewall to the tire body.

[0057] See Figure 14 and Figure 15 When the reverse wrapping assembly 23 is in use, the first drive assembly 24 drives the connecting rod seat 231 to move to the left relative to the cylinder 21, so that the reverse wrapping pressure roller 235 applies a force to the left on the bottom of the tire sidewall 30, and at the same time the reverse wrapping pressure roller 235 will receive a reaction force to the right, which causes the reverse wrapping main rod 232 and the reverse wrapping secondary rod 233 to swing clockwise around their respective lower ends. With the help of the swing of the reverse wrapping main rod 232 and the reverse wrapping secondary rod 233, the reverse wrapping pressure roller 235 will roll further upward, and at the same time the support plate 234 also moves upward, thereby supporting the originally flat tire sidewall 30, so that the tire sidewall 30 is supported on the upper surface of the support plate 234, until the connecting rod seat 231 moves to the predetermined position, at which point the support plate 234 is held in the support position (see Figure 15This supports the tire sidewall 30, providing a support platform for it. After the reverse wrapping is completed, the first drive assembly 24 drives the connecting rod seat 231 to move to the right relative to the cylinder 21, and the support plate 234 falls back down, i.e., returns to the retracted position.

[0058] from Figure 15 As can be seen, when the support plate 234 is in the support position, the angle α between the support plate 234 and the horizontal direction is 10~20°. Under the action of this angle, the support plate 234 forms a pretension on the unwrapped tire sidewall 30. The pretension causes the part of the tire sidewall 30 supported by the support plate 234 to undergo plastic deformation, thereby solving the problem of tire sidewall rebound.

[0059] See Figure 15 In order to achieve the tilt angle of the support plate 234, it is necessary to ensure that when in the support position, the upper end of the reverse wrapping main rod 232 is lower than the upper end of the reverse wrapping secondary rod 233. This ensures that the outer end of the support plate 234 is relatively higher than the inner end, that is, the support plate 234 is tilted as a whole. Furthermore, in this embodiment, when the support plate 234 is in the supported position, the main anti-wrapping rod 232 and the secondary anti-wrapping rod 233 are parallel to each other, and the lower ends of the main anti-wrapping rod 232 and the secondary anti-wrapping rod 233 are at the same height. In this case, in order to make the upper end of the main anti-wrapping rod 232 lower than the upper end of the secondary anti-wrapping rod 233, it is necessary to ensure that the length of the secondary anti-wrapping rod 233 is slightly greater than the length of the main anti-wrapping rod 232. Thus, when both the main anti-wrapping rod 232 and the secondary anti-wrapping rod 233 are "upright", the upper end of the secondary anti-wrapping rod 233 will be slightly higher than the upper end of the main anti-wrapping rod 232, and consequently, the right end of the support plate 234 will be slightly higher than the left end of the support plate 234, that is, the support plate 234 is inclined. As for the angle of inclination, the length of the secondary anti-wrapping rod 233 can be adaptively changed to make fine adjustments to meet actual production needs.

[0060] Furthermore, the inventors noted that the starting position of the aforementioned pre-tensioning should begin from the highest point of the anti-rollover pressure roller 235, as this avoids bending of the tire sidewall at the highest point of the anti-rollover pressure roller 235. More specifically, in the supported position, the upper surface of the support plate 234 should generally not be lower than the upper end point of the anti-rollover pressure roller 235. Figure 15 As can be seen, the upper surface of the support plate 234 in this embodiment is entirely above the highest point of the reverse pressure roller 235, so that after the tire sidewall passes around the highest point of the reverse pressure roller 235, it is completely and tightly attached to the upper surface of the support plate 234, and thus each position of this part of the tire sidewall 30 will be subjected to pre-stretching from the support plate 234.

[0061] Additionally, the tail end of support plate 234 ( Figure 15The right end of the support plate 234 should cover the edge of the tire sidewall. That is, when in the support position, the right end of the support plate 234 should be at least at the edge of the tire sidewall, preferably the right end of the support plate 234 should extend beyond the edge of the tire sidewall. This can prevent the edge of the tire sidewall from rebounding due to lack of pretension and ensure that all positions of the tire sidewall on the upper surface of the support plate 234 can be pre-stretched.

[0062] like Figure 4 As shown, the support plate 234 is also provided with multiple sets of rollers 236 along its length. The farthest roller 236 is located on the outer side of the tire sidewall edge. The upper end of the roller 236 is at least located on the upper surface of the support plate 234. In this way, as the support plate 234 is gradually raised, the tire sidewall can slide relative to the roller 236, avoiding excessive mechanical stretching of the tire sidewall during the process.

[0063] Furthermore, although the upper surface of the support plate 234 in this embodiment is a straight-lined plane, the possibility of using a curved surface cannot be excluded. For example, in some embodiments, the upper surface of the support plate 234 is an arc-shaped surface that is slightly raised upward or a tortuous surface formed by connecting multiple broken lines. However, regardless of the shape, it must be ensured that the upper surface of the support plate 234 is inclined as a whole.

[0064] like Figure 4 As shown, to ensure that the support plate 234 does not easily move when in the supported position, the planar four-bar linkage needs to be limited. Therefore, in this embodiment, a limiting link 237 is hinged to the middle of the reverse-wrapping auxiliary rod 233. The outer end of the limiting link 237 is connected to the second drive assembly 25. The second drive assembly 25 can drive the outer end of the limiting link 237 to move axially along the cylinder 21, thereby controlling the reverse-wrapping auxiliary rod 233 to swing accordingly. In this way, when the support plate 234 moves to the supported position, the second drive assembly 25 can fix the position of the reverse-wrapping auxiliary rod 233, thereby keeping the support plate 234 in the supported position and preventing the support plate 234 from moving. The structure of the second drive assembly 25 will be described later and will not be repeated here.

[0065] like Figure 6 and Figure 7 As shown, the first drive assembly 24 is a cylinder structure, specifically including an inner end cover 241 and an outer end cover 242 that form the inner and outer end covers of the cylinder, a first cylinder barrel 243 that is fixedly connected between the inner end cover 241 and the outer end cover 242 to form the cylinder sidewall, and a first annular piston 244 that serves as the cylinder piston. As mentioned above, in this embodiment, the first annular piston 244 is fixedly disposed on the outer circumferential surface of the cylinder body 21. Therefore, when the cylinder is actuated, the inner end cover 241, the outer end cover 242 and the first cylinder barrel 243 will move axially on the cylinder body 21.

[0066] Specifically, such as Figure 7As shown, the radial inner end of the first annular piston 244 is integrally formed on the outer surface of the cylinder 21, and the radial outer end of the first annular piston 244 is sealed to the inner wall of the first cylinder 243 by a sealing ring, thereby dividing the interior of the first cylinder 243 into two non-connected chambers, referred to as the left chamber 243a and the right chamber 243b respectively. Therefore, it is only necessary to control the air pressure in the left chamber 243a and the right chamber 243b to achieve the relative axial movement between the first annular piston 244 and the first cylinder 243. In fact, the inner end cap 241, the outer end cap 242 and the first cylinder 243 move axially on the cylinder 21.

[0067] like Figure 8 As shown, in order to control the air pressure in the left chamber 243a and the right chamber 243b, the left chamber 243a is provided with a left air inlet / outlet 244a for air to enter and exit, and the right chamber 243b is provided with a right air inlet / outlet 244b for air to enter and exit. For example, when it is necessary to increase the air pressure in the left chamber 243a, compressed air is simply ejected from the left air inlet / outlet 244a, and the air in the right chamber 243b is discharged from the right air inlet / outlet 244b; when it is necessary to increase the air pressure in the right chamber 243b, compressed air is simply ejected from the right air inlet / outlet 244b, and the air in the left chamber 243a is discharged.

[0068] Specifically, such as Figure 8 As shown, the left inlet / outlet port 244a is located on the left side of the piston body 2442, facing the left chamber 243a. Simultaneously, the cylinder 21 has a first gas passage 213 connected to the left inlet / outlet port 244a. The gas inlet of the first gas passage 213 is located on the flange 212 at the end of the cylinder 21 for subsequent connection to a gas pipeline. Similarly, the right inlet / outlet port 244b is located on the right side of the piston body 2442, facing the right chamber 243b. The cylinder 21 also has a second gas passage 214 connected to the right inlet / outlet port 244b. The gas inlet of the second gas passage 214 is located on the flange 212 at the end of the cylinder 21 for subsequent connection to a gas pipeline.

[0069] Through the gas channel set inside the cylinder 21, the pressure in the left chamber 243a and the right chamber 143b can be controlled freely, thereby controlling the axial movement of the inner end cap 241 on the cylinder 21 and realizing the reverse wrapping action of the reverse wrapping assembly 23.

[0070] like Figure 6 As shown, in this embodiment, the inner end cap 241 is disposed on the side facing the reverse packaging assembly 23. Therefore, the inner end cap 241 is equivalent to the output end of the first driving assembly 24, used to drive the connecting rod seat 231 to move axially on the cylinder 21. In order to smoothly fix the connecting rod seat 231 onto the inner end cap 241, the inner end of the inner end cap 241 ( Figure 6 The inner end cap 241 has an integrally formed cylindrical annular drive sleeve 245. The inner circumferential surface of the annular drive sleeve 245 is slidably disposed on the outer surface of the cylinder 21. The connecting rod seat 231 is fixedly disposed on the outer surface of the annular drive sleeve 245 by bolts. Thus, when the air pressure in the right chamber 243b increases and the air pressure in the left chamber 243a decreases, the inner end cap 241 will drive the annular drive sleeve 245 to move to the left on the cylinder 21. In turn, the annular drive sleeve 245 drives the connecting rod seat 231 to move to the left, thereby switching the support plate 234 from the retracted position to the support position.

[0071] like Figure 5 As shown, multiple fixing positions are formed circumferentially on the outer surface of the annular drive sleeve 245. The aforementioned connecting rod seat 231 is fixedly disposed within the fixing positions. Specifically, in this embodiment, the annular drive sleeve 245 is provided with a radially outwardly protruding annular boss 2451. The annular boss 2451 has multiple mounting holes distributed circumferentially, and the locations of these mounting holes are the aforementioned fixing positions. The bottom of the connecting rod seat 231 is provided with a groove that matches the annular boss 2451. The connecting rod seat 231 is provided with a connecting hole corresponding to the mounting hole. Bolts pass through the connecting hole and are threaded into the mounting hole, thereby fixing the connecting rod seat 231 onto the annular boss 2451.

[0072] like Figure 4 As shown, the inner end cover 241 has a plurality of accommodating grooves 2411 with end openings evenly arranged in the circumferential direction. The positions of the accommodating grooves 2411 correspond one-to-one with the positions of the reverse wrapping assembly 23. The middle part of the limiting link 237 mentioned above is located inside the accommodating groove 2411. Specifically, the limiting link 237 is an arc shape with the middle part protruding radially outward. When the second drive assembly 25 drives the right end of the limiting link 237 to move axially, the middle part of the limiting link 237 will be displaced axially in the accommodating groove 2411.

[0073] like Figure 7 As shown, in order to facilitate the assembly between the inner end cover 241, the outer end cover 242 and the first cylinder 243, the inner end cover 241 and the outer end cover 242 are respectively provided with axially protruding and annular shoulders 2421 and 2421. The left end of the first cylinder 243 is fitted on the shoulder 2421 and is fixedly connected to the inner wall of the inner end cover 241 by bolts. The right end of the first cylinder 243 is fitted on the shoulder 2421 and is fixedly connected to the inner wall of the outer end cover 242 by bolts.

[0074] Furthermore, it should be noted that when the above three components move axially on the cylinder 21, necessary circumferential limiting is required to prevent circumferential rotation during axial movement. Therefore, in this embodiment, a limiting rod 246 extending axially is fixedly provided between the inner wall of the inner end cap 241 and the inner wall of the outer end cap 242 (see...). Figure 6 The middle part of the limiting rod 246 passes through the limiting hole 2441 of the first annular piston 244. So when the inner end cover 241, the first cylinder 243 and the outer end cover 242 move axially together, the limiting rod 246 will be pulled in the limiting hole 2441 of the first annular piston 244, thereby preventing the inner end cover 241, the first cylinder 243 and the outer end cover 242 from rotating around the circumference.

[0075] like Figure 7 As shown, to facilitate the manufacturing of the first annular piston 244, in this embodiment, the first annular piston 244 includes a piston body 2442 integrally formed on the cylinder 21 and a piston ring 2443 detachably mounted on the piston body 2442. The piston body 2442 and the piston ring 2443 are fixedly connected by bolts, and the two are connected to form a complete first annular piston 244. By manufacturing the first annular piston 244 in separate parts, the processing difficulty is reduced.

[0076] The first drive assembly 24 operates as follows: When the connecting rod seat 231 needs to be moved to the left to achieve the reverse wrapping action, compressed air from the outside enters through the first gas channel 213 and exits through the left air inlet / outlet port 244a, thereby increasing the air pressure in the left chamber 243a and making it greater than the air pressure in the right chamber 243b. The gas in the right chamber 243b is then discharged to the outside through the right air inlet / outlet port 244b, which in turn drives the inner end cover 241, the first cylinder 243, and the outer end cover 242 to move to the left on the cylinder 21. The annular drive sleeve 245 moves to the left accordingly, thus achieving the desired effect. The connecting rod seat 231 moves to the left; when it is necessary to drive the connecting rod seat 231 to move to the right for reset, compressed air from the outside enters through the second gas channel 214 and exits through the right air inlet / outlet port 244b, thereby increasing the air pressure in the right chamber 243b and making it greater than that in the left chamber 243a. The gas in the left chamber 243a is then discharged to the outside through the left air inlet / outlet port 244a, thereby driving the inner end cover 241, the first cylinder 243, and the outer end cover 242 to move to the right on the cylinder 21. The annular drive sleeve 245 moves to the right accordingly, thus achieving the reset of the connecting rod seat 231.

[0077] like Figure 7 As shown in the figure, it can be clearly observed that the radial outer end 2422 of the outer end cap 242 is located outside the outer surface of the first cylinder 243, that is, the outer diameter of the outer end cap 242 is larger than that of the second cylinder 252, thereby forming an L-shaped step surface at the connection between the second cylinder 252 and the outer end cap 242. This step surface will serve as one of the wall surfaces of the piston chamber 253 of the second drive assembly 25 in the following text. Figure 9An exploded view of the second drive assembly 25 is shown. As can be seen from the figure, the second drive assembly 25 includes a second annular piston 251 slidably disposed axially on the outer circumferential surface of the first cylinder 243, and a second cylinder body 252 whose right end is fixedly connected to the right end of the outer end cover 242 and which surrounds the outer circumference of the first cylinder 243. Figure 10 As shown, the radial outer end of the second annular piston 251 is sealed to the inner wall of the second cylinder 252 by a sealing ring. Thus, a sealed piston cavity 253 is formed between the right side of the second annular piston 251, the inner wall of the second cylinder 252, the L-shaped stepped surface mentioned above, and the outer wall of the first cylinder 243. By controlling the air pressure inside the piston cavity 253, the second annular piston 251 can be driven to move axially within the annular area formed by the first cylinder 243 and the second cylinder 252.

[0078] like Figure 9 and Figure 10 As shown, the second drive assembly 25 also includes a ring-shaped drive ring 254 fixedly connected to the left side of the second annular piston 251. The drive ring 254 is sleeved on the outer surface of the first cylinder 243. Under the drive of the second annular piston 251, it can move axially along the outer surface of the first cylinder 243. As can be seen from the figure, the left end of the second cylinder 252 is open, so the left end of the drive ring 254 can be connected to the outside. That is, the drive ring 254 serves as the output component of the second drive assembly 25 and is used to connect with the limiting link 237.

[0079] In this embodiment, as Figure 9 As shown, the drive ring 254 facing the reverse wrapping assembly 23 has several circumferentially arranged connection ports 2541. A hinge shaft is provided in the connection port 2541. The right end of the limiting link 237 mentioned above is hinged to the hinge shaft. Thus, when the drive ring 254 moves axially, it can drive the limiting link 237 to move axially, thereby controlling the position of the reverse wrapping auxiliary rod 233. In this embodiment, it is mainly used to keep the reverse wrapping auxiliary rod 233 in the support position and prevent it from deviating.

[0080] like Figure 9 As shown, a plurality of connecting rods 255 are provided between the drive ring 254 and the second annular piston 251, and the drive ring 254 is fixedly connected to the second annular piston 251 through these connecting rods 255.

[0081] like Figure 10As shown, in order to control the air pressure inside the piston chamber 253, an air inlet / outlet port 2531 for air entry and exit is provided in the piston chamber 253. In this embodiment, the air inlet / outlet port 2531 is located on the outer end cover 242, or more precisely, on the L-shaped stepped surface. Thus, by simply connecting the connecting pipe in the gas pipeline to the air inlet / outlet port 2531, the air pressure inside the piston chamber 253 can be controlled. For example, if compressed air is injected into the air inlet / outlet port 2531, the air pressure inside the piston chamber 253 increases, causing the second annular piston 251 to move to the left. Conversely, if the gas in the piston chamber 253 is extracted, the air pressure inside the piston chamber 253 decreases, causing the second annular piston 251 to move to the right under the influence of external atmospheric pressure.

[0082] The second drive assembly 25 operates as follows: During the process of the reverse-wrapping assembly 23 moving from the retracted position to the supported position, the gas in the piston chamber 253 is extracted from the inlet / outlet 2531, causing the gas pressure in the piston chamber 253 to be lower than the external atmospheric pressure. The second annular piston 251 moves to the right along the outer surface of the first cylinder 243, thereby driving the right end of the limiting rod 237 to move to the right. This allows the right end of the limiting rod 237 to be housed within the annular area formed by the first cylinder 243 and the second cylinder 252, ensuring that the position of the limiting rod 237 does not move, thus ensuring that the reverse-wrapping assembly 23 always remains in the supported position. Conversely, when compressed air is injected into the piston chamber 253 through the inlet / outlet 2531, the gas pressure in the piston chamber 253 becomes higher than the external atmospheric pressure. Consequently, the second annular piston 251 moves to the left, causing the limiting rod 237 to move to the left, thus switching the reverse-wrapping assembly 23 to the retracted position.

[0083] like Figure 11 and Figure 12 As shown, the locking ring assembly 22 includes an inner shell 221 fixedly disposed at the inner end of the cylinder 21, an outer shell 222 disposed opposite to the right side of the inner shell 221 and forming an annular mounting opening 223 between the outer shell 221 and the inner shell 221, a locking ring piston 224 slidably disposed axially between the inner shell 221 and the outer shell 222, and a locking ring block 225 disposed on the outer periphery of the locking ring piston 224 and located within the mounting opening 223. When the locking ring piston 224 moves axially inward or outward, the locking ring block 225 extends radially or retracts within the mounting opening 223. It should be noted that there are actually multiple locking ring blocks 225, which are evenly distributed around the circumference. Figure 11 Only one is shown in the image for illustrative purposes.

[0084] like Figure 12As shown, the inner housing 221 includes a first end cap 2211 as its left end face and a first peripheral wall 2212 located at the right end of the first end cap 2211 and extending circumferentially to form a sidewall. A through hole is formed at the center of the first end cap 2211, the diameter of which is adapted to the opening at the left end of the cylinder 21, so that after the locking ring assembly 22 is installed on the cylinder 21, the cylinder 21 can still be assembled onto the outer periphery of the main shaft 11. The first end cap 2211 is fixedly connected to the left end of the cylinder 21 by bolts, thus fixing the inner housing 221 onto the cylinder 21. A first ring 2213 extending radially outward is provided on the outer periphery of the right end of the first peripheral wall 2212. The first ring 2213 forms the left side wall of the mounting port 223 and is used to fixably connect with the outer housing 222, thereby fixing the outer housing 222 relatively to the cylinder 21.

[0085] like Figure 12 As shown, the outer casing 222 includes a second end cap 2221 as its right end face and a second circumferential wall 2222 disposed at the left end of the second end cap 2221 and extending circumferentially to form a sidewall. The diameter of the second circumferential wall 2222 is smaller than that of the first circumferential wall 2212. A second ring body 2223 extending radially outward is disposed on the outer periphery of the second circumferential wall 2222. The second ring body 2223 is disposed facing the first ring body 2213 and separated by a distance, thereby forming the mounting opening 223 between them. Figure 11 As shown, within the mounting port 223, a plurality of axially extending fixing rods 226 are provided between the first ring body 2213 and the second ring body 2223. Figure 11 Only one is shown in the figure, but in reality there are 20 to 30 rings evenly arranged around the circumference. The second ring 2223 is fixedly connected to the first ring 2213 by the fixing rod 226, so that the outer shell 222 is fixedly connected to the inner shell 221.

[0086] See also Figure 12An axial space is provided inside the inner shell 221 and the outer shell 222. The locking ring piston 224 is disposed within this space, and its inner surface is slidably connected to the outer surface of the cylinder 21. The left end of the locking ring piston 224 is sealed to the inner wall of the first circumferential wall 2212, and the right end is sealed to the inner wall of the second circumferential wall 2222. This forms a first chamber 224a at the left end of the locking ring piston 224 and a second chamber 224b at the right end. The air pressure in the first chamber 224a and the second chamber 224b is controlled. This allows for the corresponding control of the axial movement of the locking ring piston 224. For example, when the air pressure in the first chamber 224a is less than that in the second chamber 224b, the locking ring piston 224 will move to the left to the first working position. At this time, the left end of the locking ring piston 224 abuts against the inner wall of the first end cover 2211, and the locking ring block 225 is in a contracted state. Conversely, when the air pressure in the first chamber 224a is greater than that in the second chamber 224b, the locking ring piston 224 will move to the right to the second working position. At this time, the right end of the locking ring piston abuts against the inner wall of the second end cover 2221, and the locking ring block 225 is in an expanded state. By moving the locking piston 224 axially between the inner housing 221 and the outer housing 222, the locking block 225 can move radially in the mounting port 223. Since the two working positions of the locking piston 224 are defined by the inner housing 221 and the outer housing 222 respectively, the starting position and the ending position of the locking block 225 are determined, thereby ensuring that the locking block 225 can provide consistent radial tension after expansion, thus ensuring that the tire bead is stably expanded at all points.

[0087] like Figure 12 As shown, in order to achieve the air pressure change between the first chamber 224a and the second chamber 224b, a first air inlet / outlet hole 2151 is provided on the outer surface of the cylinder 21 at a position corresponding to the first chamber 224a, and a second air inlet / outlet hole 2161 is provided on the outer surface of the cylinder at a position corresponding to the second chamber 224b. The inside of the cylinder 21 is provided with a first air inlet / outlet channel 215 and a second air inlet / outlet channel 216 that are respectively connected to the first air inlet / outlet hole 2151 and the second air inlet / outlet hole 2161. The right end of the first air inlet / outlet channel 215 and the second air inlet / outlet channel 216 is a duct interface for connecting to an external air source. In this embodiment, the duct interface is located on the flange 212 at the right end of the cylinder 21.

[0088] Figure 13A schematic diagram of the locking ring piston 224 and locking ring block 225 is shown. As can be seen from the diagram, several mounting seats 2241 are bolted to the circumference of the locking ring piston 224. A connecting shaft is mounted on each mounting seat 2241. The locking ring block 225 is connected to the connecting shaft via a locking ring connecting rod 2251. Therefore, when the locking ring piston 224 moves axially, the locking ring connecting rod 2251 will drive the locking ring block 225 to move radially. Specifically, as... Figure 11 As shown, the left end face of the second ring 2223 is provided with a number of guide strips 2224 extending radially in a straight line around the circumference. Corresponding to the guide strips 2224, the locking ring block 225 is provided with a guide groove 2252 extending radially in a straight line. The guide groove 2252 slides on the guide strips 2224, so that when the locking ring block 225 is radially displaced, it receives good guidance and will not deviate.

[0089] In addition, such as Figure 13 As shown in the figure, the locking ring block 225 in this embodiment includes a first locking ring block 225a and a second locking ring block 225b. The first locking ring block 225a and the second locking ring block 225b are arranged alternately in the circumferential direction to form a complete circle. It can be clearly seen from the figure that the size of the first locking ring block 225a is much larger than that of the second locking ring block 225b. In fact, the arc length of the first locking ring block 225a is about three times that of the second locking ring block 225b. The reason for this design is that after the locking ring block 225 expands radially outward, it must form a complete circle. If all the locking ring blocks 225 have the same size, radial contraction cannot be achieved. Therefore, at least two locking ring blocks 225 with different shapes are required. For example, in this embodiment, when contracting, the diameter of the second locking ring block 225b will be smaller than the diameter of the first locking ring block 225a, that is, the second locking ring block 225b will be housed between two adjacent first locking ring blocks 225a. Furthermore, when the arc length of a locking ring block 225 is relatively small, it is easier to achieve radial contraction and expansion.

[0090] like Figure 13 As shown, in order to better adapt to the above-mentioned expansion and contraction movements, the boundary line of the first locking ring block 225a is inclined, which is reflected in the figure as the outer circumference of the closer to the radial direction is larger. Correspondingly, the boundary line of the second locking ring block 225b is inclined in the opposite direction, which is reflected in the figure as the outer circumference of the closer to the radial direction is smaller.

[0091] In addition, it should be noted that the lengths and connection positions of the locking ring connecting rods 2251 on the first locking ring block 225a and the second locking ring block 225b are slightly different, so that the diameters of the two when they contract are different, while the diameters when they expand are the same.

[0092] like Figure 11 and Figure 12As shown, when the locking ring assembly 22 is in use, external compressed air enters the first inlet / outlet air passage 215 and enters the first chamber 224a through the first inlet / outlet air hole 2151. Consequently, the air pressure in the first chamber 224a is higher than that in the second chamber 224b, causing the locking ring piston 224 to move to the right. As the locking ring piston 224 moves to the right, the locking ring connecting rod 2251 located on the mounting base 2241 will swing around its lower end, thereby causing the locking ring block 225 to expand radially outward along the guide bar 2224. Conversely, when external compressed air enters the second inlet / outlet air passage 216 and enters the second chamber 224b through the second inlet / outlet air hole 2161, the air pressure in the second chamber 224b is higher than that in the first chamber 224a, causing the locking ring piston 224 to move to the left. The locking ring connecting rod 2251 located on the mounting base 2241 will swing around its lower end, thereby causing the locking ring block 225 to contract radially inward along the guide bar 2224.

[0093] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A bead-locking device, comprising a cylindrical body (21), a bead-locking assembly (22) fixedly disposed on the outer periphery of the cylindrical body (21) for fixing the bead, and a bead-locking assembly (23) disposed on one side of the bead-locking assembly and moving along the axial direction of the cylindrical body for reversing the bead-locking of the tire sidewall, characterized in that, The locking ring assembly (22) includes an inner shell (221) and an outer shell (222) spaced axially on the outer periphery of the cylinder (21). A locking ring piston (224) is slidably disposed on the outer periphery of the cylinder (21) between the inner shell (221) and the outer shell (222). A first chamber (224a) is formed between the locking ring piston (224) and the inner shell (221), and a second chamber (224b) is formed between the locking ring piston (224) and the outer shell (222). By controlling the pressure in the first chamber (224a) and the second chamber (224b), the locking ring piston (224) is moved within the inner shell. The inner shell (221) and the outer shell (222) reciprocate between each other; an annular mounting port (223) with an open end is also formed between the inner shell (221) and the outer shell (222). Several locking ring blocks (225) are arranged around the circumference and can reciprocate along the radial direction. Each locking ring block (225) is hinged to the locking ring piston (224) through a corresponding locking ring connecting rod (2251). When the locking ring piston (224) moves axially back and forth on the cylinder (21), it drives each locking ring block (225) to move radially back and forth in the mounting port (223). A first ring (2213) extending circumferentially is formed on the outer periphery of the inner shell (221), and a second ring (2223) extending circumferentially is formed on the outer periphery of the outer shell (222). The first ring (2213) and the second ring (2223) face each other and are spaced apart, thereby forming the mounting port (223) between them. The locking ring piston (224) has multiple mounting seats (2241) arranged in the circumferential direction. The lower end of the locking ring connecting rod (2251) is hinged to the mounting seat (2241), and the upper end of the locking ring connecting rod (2251) is hinged to the locking ring block (225).

2. The bead locking device according to claim 1, characterized in that, The locking piston (224) moves axially on the cylinder (21) to have a first working position and a second working position. When the locking piston (224) is in the first working position, the end of the locking piston (224) abuts against the inner wall of the inner shell (221). When the locking piston (224) is in the second working position, the end of the locking piston (224) abuts against the inner wall of the outer shell (222).

3. The bead locking device according to claim 2, characterized in that, The inner housing (221) includes a first end cap (2211) and a first peripheral wall (2212), and the outer radial end of the locking ring piston (224) abuts against the first peripheral wall (2212), thereby forming the first chamber (224a) between the first end cap (2211) and the locking ring piston (224), and when the locking ring piston (224) is in the first working position, the end of the locking ring piston (224) abuts against the first end cap (2211); The outer casing (222) includes a second end cap (2221) and a second peripheral wall (2222), and the outer radial end of the locking ring piston (224) abuts against the second peripheral wall (2222), thereby forming the second chamber (224b) between the second end cap (2221) and the locking ring piston (224), and when the locking ring piston (224) is in the second working position, the end of the locking ring piston (224) abuts against the second end cap (2221).

4. The bead locking device according to claim 1, characterized in that, The first ring body (2213) and / or the second ring body (2223) are provided with radially extending guide strips (2224) on the inner wall facing the mounting port (223), and the locking ring block (225) is provided with guide grooves (2252) corresponding to the guide strips (2224), and the guide grooves (2252) are fitted into the guide strips (2224).

5. The bead locking device according to claim 1, characterized in that, The outer surface of the cylinder (21) is provided with a first air inlet / outlet hole (2151) communicating with the first chamber (224a) and a second air inlet / outlet hole (2161) communicating with the second chamber (224b). The inside of the cylinder (21) is provided with a first air inlet / outlet channel (215) communicating with the first air inlet / outlet hole (2151) and a second air inlet / outlet channel (216) communicating with the second air inlet / outlet hole (2161). The pressure change of the first chamber (224a) and the second chamber (224b) is realized by opening and closing the first air inlet / outlet hole (2151) and the second air inlet / outlet hole (2161).

6. The bead locking device according to claim 1, characterized in that, The locking ring block (225) includes a first locking ring block (225a) and a second locking ring block (225b). The first locking ring block (225a) and the second locking ring block (225b) are arranged alternately in the circumferential direction. When the locking ring block (225) expands radially outward, the first locking ring block (225a) and the second locking ring block (225b) are located on the same circumference, and their boundaries abut without gaps. When the locking ring block (225) contracts radially inward, the first locking ring block (225a) and the second locking ring block (225b) are located on different circumferences and are misaligned with each other.

7. The bead locking device according to claim 6, characterized in that, The arc length of the first locking block (225a) is greater than that of the second locking block (225b), and the boundary lines of the first locking block (225a) and the second locking block (225b) are mutually compatible oblique lines.

8. The bead locking device according to claim 1, characterized in that, The reverse wrapping assembly (23) moves axially along the cylinder (21) under the drive of the first drive assembly (24) to have a support position and a retracted position, and the reverse wrapping assembly (23) reverses the tire sidewall during the process from the retracted position to the support position. The reverse wrapping assembly (23) includes a support plate (234), which moves radially outward along the cylinder (21) during the process from the retracted position to the support position of the reverse wrapping assembly (23) to provide a support platform for the tire sidewall. In the support position, the angle between the support plate (234) and the horizontal plane is 10~20°.

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