Tire Building Drum

Abstract

The present invention provides a tire building drum, comprising: a drum shaft, in which a screw rod and two nuts on the screw rod are arranged; two side drums, which are located on the drum shaft and are arranged oppositely; a middle drum, which is located between the two side drums, and the middle drum comprises two half drums that can be axially embedded and matched with each other; the tire building drum also comprises a sleeve arranged between each side drum and the drum shaft, one end of each sleeve is connected to the adjacent half drum, and the other end is connected to the corresponding side drum, and the side drum can be axially moved on the sleeve to approach or move away from the adjacent half drum; two nuts are respectively connected to the two side drums, and when the screw rod rotates, the two nuts can sequentially push the side drums, sleeves, and half drums on both sides to move relatively at the same time; each side drum comprises a turn-up assembly, and the turn-up assembly can turn up the rubber material attached thereto. The tire building drum of the present invention can improve the tire making efficiency of the tire building machine, and is suitable for tire building of more specifications.

Description

Technical Field

[0001] The invention relates to the technical field of tire molding, and in particular to a mechanical tire molding drum applied to a tire molding machine. Background Art

[0002] At present, the double-process one-time forming tire drum mainly uses the capsule wrapping method to reverse the rubber coated on the forming drum, and the reverse wrapping process is a necessary process step for forming tires. However, when the rubber is reversed by the capsule wrapping method, the capsule cannot reverse the rubber by itself, and a booster plate mechanism needs to be installed on the tire forming machine to assist the capsule in the reverse wrapping process through the booster plate mechanism to achieve the effect of compacting the reversed rubber. However, due to the existence of the booster plate mechanism, the single cycle time of the rubber reverse wrapping is very long, and at the same time, it also leads to the complexity of the tire forming machine structure and cumbersome control.

[0003] In view of this, it is necessary to provide an improved tire building drum to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a tire building drum with a mechanical turn-up mechanism to solve the above technical problems.

[0005] To achieve the above object, the present invention provides a tire building drum, comprising:

[0006] A tire building drum, comprising:

[0007] A drum shaft, which is provided with a lead screw and two nuts arranged outside the lead screw;

[0008] Two side drums are located on the drum shaft and are arranged opposite to each other;

[0009] A middle drum, located between the two side drums, the middle drum comprising two half drums that can be axially embedded and matched with each other;

[0010] The tire building drum further comprises a sleeve disposed between each of the side drums and the drum shaft, one end of each sleeve being connected to the adjacent half-drum and the other end being connected to the corresponding side drum, and a portion of the side drum being movable axially along the sleeve to approach or move away from the adjacent half-drum;

[0011] The two nuts are respectively connected to the two side drums, and when the screw rod rotates, the two nuts can respectively drive the corresponding side drum, the shaft sleeve, and the half drum to move relatively at the same time;

[0012] Each of the side drums includes a turn-up assembly, which includes a cylinder body arranged on the radial periphery of the drum shaft, an axially movable second piston located on the radial inner side of the cylinder body, and a plurality of turn-up rods arranged along the circumferential direction and pivotally connected to the second piston. The turn-up assembly is used for turning up the rubber material attached to the plurality of turn-up rods.

[0013] Further, each of the side drums further comprises a bead locking assembly disposed close to the half-drum and a driving assembly for driving the bead locking assembly and the turn-up assembly to move axially together;

[0014] The driving assembly includes a support member for supporting the turn-up assembly and the tire bead locking assembly, and a first piston fixedly connected to one end of the sleeve, wherein the first piston is connected to the nut.

[0015] Furthermore, the support member includes a first support member, a second support member connected to the first support member, and a third support member connected to the second support member. A closed air cavity is formed between the first support member, the second support member, and the sleeve. One end of the first piston is located in the air cavity, and the air cavity is divided into a first air cavity and a second air cavity.

[0016] Furthermore, the tire bead locking assembly is located between the second support member and the third support member, and includes a first wedge block arranged around the drum shaft and a plurality of second wedge blocks circumferentially arranged between the second support member and the third support member. The first wedge block moves axially to abut against a plurality of the second wedge blocks to drive the plurality of the second wedge blocks to move radially synchronously.

[0017] Furthermore, an air cavity is formed between the first support member, the second support member, and the outer cylinder body, and the second piston is located in the air cavity and divides the air cavity into a third air cavity and a fourth air cavity.

[0018] Furthermore, a first air channel connected to the third air cavity is provided on the turn-up assembly, and the first air channel passes through the first support member, and gas can enter the third air cavity from the first air channel to push the second piston;

[0019] The turn-up component is provided with a second air passage connected to the fourth air cavity. The second air passage passes through the first support member, the second support member and the second piston. Gas can enter the fourth air cavity from the second air passage to push the second piston.

[0020] Furthermore, each of the turn-up rods includes a main body portion extending along the axial direction and a bent portion bent radially inward relative to the main body portion, and a turn-up roller is provided at one end of the bent portion.

[0021] Furthermore, the turn-up assembly also includes an adjusting member disposed in the fourth air chamber, wherein the adjusting member has a certain axial length and can abut against the second piston to limit the axial movement distance of the second piston.

[0022] Furthermore, the turn-up assembly also includes a guide member arranged on the second support member and a base connecting the second piston and the plurality of turn-up rods, the guide member is arranged opposite to the base, and the guide member is provided with a plurality of guide grooves for accommodating the turn-up rods.

[0023] Furthermore, the first support member, the second support member, the cylinder body, and the second piston are all provided with sealing members.

[0024] Furthermore, the cover plate assembly includes a base arranged at the radial periphery of the turn-up assembly, a plurality of extensions arranged at circumferential intervals and fixedly connected to the base, and a driving mechanism connected to the base and driving the base to move axially away from the middle drum.

[0025] Furthermore, each of the cover plate assemblies also includes a reset mechanism that can drive the base to reset, the reset mechanism includes a fixing member that passes through the base of the cover plate assembly and is fixedly connected to the support member, and an elastic member arranged between the fixing member and the base of the cover plate assembly, and the base can move axially relative to the fixing member.

[0026] The beneficial effects of the present invention are as follows: the tire building drum of the present invention performs a turn-up process by providing a turn-up component, thereby replacing the traditional bladder and bladder booster plate, simplifying the structure of the tire building machine, reducing the time of the turn-up action, and improving the efficiency of forming tire blanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional comparison diagram of the tire building drum of the present invention in a flat drum state and a turned-up state.

[0028] Figure 2 It is a cross-sectional view of the tire building drum of the present invention in which the side drum and the middle drum are separated.

[0029] Figure 3 It is a cross-sectional view of the tire building drum of the present invention when the tire building drum is in a flat drum state.

[0030] Figure 4 , Figure 5 It is a cross-sectional view of the radially expanded left and right half-drums of the tire bead locking assembly of the tire building drum of the present invention, as well as an exploded view of local details and an enlarged view of local details.

[0031] Figure 6 , Figure 7It is a cross-sectional view of the left and right half drums of the turn-up assembly of the tire building drum of the present invention in the turn-up state and an enlarged view of local details.

[0032] Figure 8 , Fig. 9 It is a cross-sectional view of the left and right half drums when the cover plate assembly of the tire building drum of the present invention does not cover the turn-up roller, and an enlarged view of the local details. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below in conjunction with various embodiments shown in the accompanying drawings. The present invention will be described below in conjunction with the accompanying drawings.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides a tire building drum 1, which includes a hollow drum shaft 10, two side drums 20 arranged oppositely on the drum shaft 10, a screw nut pair 30 located in the drum shaft 10, and a middle drum 40 located between the two side drums 20, wherein the screw nut pair 30 includes a screw 301 and two nuts 302 arranged outside the screw 301, and the two nuts 302 are respectively connected to the two side drums 20. The middle drum 40 includes two half drums 41 that can be axially embedded and matched with each other, and a shaft sleeve 50 is also provided between each side drum 20 of the tire building drum and the drum shaft 10, and one end of each shaft sleeve 50 is connected to the adjacent half drum 41, and the other end is connected to the corresponding side drum 20. The left side drum 20, the left shaft sleeve 50, and the left half drum 41 form a whole as the left half 1-1, and the right side drum 20, the right shaft sleeve 50, and the right half drum 41 form a whole as the right half 1-2. The left half 1-1 and the right half 1-2 are basically symmetrical. The left half 1-1 and the right half 1-2 are respectively connected with two nuts 302. When the screw nut pair 30 is actuated, that is, when the screw 301 rotates, the two nuts 302 can respectively push the two half drums 41 to axially fit in / away from each other, so that the left half 1-1 and the right half 1-2 move relatively, thereby changing the distance H between the shoulders of the middle drum 40, that is, the over-setting value of the tire process, so as to produce tires of different specifications, thereby improving the adaptability and versatility of the tire building drum.

[0035] like Figure 1 As shown, the middle drum 40 can contract and expand in the radial direction. Figure 1 As shown in the upper half of the figure, when the middle drum 40 is in a contracted state in the radial direction and the two side drums 20 are close to the middle drum 40, the drum diameter of the middle drum 40 is substantially equal to the drum diameter of the two side drums 20, so that the outer circumferential surface of the middle drum 40 and the outer circumferential surface of the side drums 20 can form a substantially complete cylindrical surface, which can be used to receive materials, for example Figure 3 As shown. Figure 1As shown in the lower half of the figure, when the middle drum 40 is in a radially expanded state and the two side drums 20 are close to the middle drum 40, the two half drums 41 move axially relative to each other and fit into each other until the distance H between the two drum shoulders of the middle drum 40 reaches the over-standard value of the tire process.

[0036] like Figure 1 As shown, both half drums 41 are provided with large drum tiles (not shown) and small drum tiles (not shown) spaced apart from each other in the circumferential direction, and both the large drum tiles and the small drum tiles include finger-like structures (not shown). The cylinder-like structure is used to drive the large drum tiles and the small drum tiles to contract and expand in the radial direction. When the middle drum 40 is in a contracted state in the radial direction, the radial height of the large drum tiles is greater than the radial height of the small drum tiles, so the small drum tiles form a cylindrical surface that contracts within the cylindrical surface formed by the large drum tiles; when the middle drum 40 is in an expanded state in the radial direction, the radial height of the large drum tiles is equal to the radial height of the small drum tiles, so the large drum tiles and the small drum tiles form a cylindrical surface. At this time, the finger-like structures of the large drum tiles and the small drum tiles are evenly distributed in the circumferential direction. When the two half drums 41 move relative to each other axially, the finger-like structures of the two half drums 41 can mesh with each other, so that the two half drums 41 can be axially embedded and matched.

[0037] like Figures 1 to 3 As shown, each side drum 20 includes a tire bead locking assembly 21 disposed near one end of the half drum 41, a turn-up assembly 22 for turning up the rubber material 2, a cover assembly 23 for shielding part of the turn-up assembly 22, and a driving assembly for driving the tire bead locking assembly 21, the turn-up assembly 22, and the cover assembly 23 to move axially together. The driving assembly is also a cylinder-like structure, including a support member 241 for supporting the turn-up assembly 22, the cover assembly 23, and the tire bead locking assembly 21, and a first piston 242 fixedly connected to one end of the sleeve 50, and the first piston 242 is connected to the nut of the screw nut pair 30. The support member 241 includes a first support member 241a, a second support member 241b connected to the first support member 241a, and a third support member 241c connected to the second support member 241b, which are sequentially distributed along the axial direction. Among them, the second support member 241b and the third support member 241c jointly support the tire bead locking assembly 21, and the first support member 241a and the second support member 241b jointly support the turn-up assembly 22 and the cover assembly 23. Furthermore, the first support member 241a, the second support member 241b and the shaft sleeve 50 form a closed air cavity, one end of the first piston 242 is located in the air cavity, and the air cavity is divided into a first air cavity 243 and a second air cavity 244. When the first air cavity 243 is inflated and the second air cavity 244 is evacuated, the side drum 20 (except the first piston 242) can be close to the half-drum 41 on the corresponding side. When the second air cavity 244 is inflated and the first air cavity 243 is evacuated, the side drum 20 (except the first piston 242) can be away from the half-drum 41 on the corresponding side. Figure 2As shown, when the side drum 20 is away from the half drum 41 on the corresponding side, a space is left between the side drum 20 and the half drum 41. The space can satisfy the positive wrapping process in the secondary molding process, that is, the newly bonded sidewall material (not shown) is positively wrapped and rolled on one side beyond the edge of the middle drum 40.

[0038] like Figures 3 to 5 As shown, the bead locking assembly 21 is located on the side of the second support member 241b close to the middle drum 40, and includes a first wedge block 210 arranged around the drum shaft 10 and a plurality of second wedge blocks 211 arranged circumferentially around the drum shaft 10 and located between the second support member 241b and the third support member 241c. The first wedge block 210 abuts against the plurality of second wedge blocks 211. The first wedge block 210 has a first inclined surface 212, and each second wedge block 211 has a second inclined surface 213. The first wedge block 210 moves axially so that the first inclined surface 212 abuts against the second inclined surfaces 213 of the plurality of second wedge blocks 211, thereby driving the plurality of second wedge blocks 211 to move synchronously in the radial direction, so that the plurality of second wedge blocks 211 can contract or expand synchronously in the radial direction. The radial periphery of each second wedge block 211 is provided with a return spring (not shown) and a capsule 214 in sequence. When the plurality of second wedge blocks 211 contract radially, the return spring can provide radial contraction force to the plurality of second wedge blocks 211, and after the plurality of second wedge blocks 211 contract radially, the outer circumferential surface of the bladder 214 remains flush with the outer circumferential surfaces of the middle drum 40 and the side drum 20. When the plurality of second wedge blocks 211 expand radially, the bladder 214 can cooperate with the inner circumferential surface of the tire bead material 3, thereby locking the tire bead material 3 and completing the tire beading step of the tire process.

[0039] like Figures 3 to 5 As shown, the second support member 241b is recessed toward one side of the first wedge block 210 to form a groove 215, and the groove 215 is in a ring shape. The first wedge block 210 is accommodated in the groove 215. The third support member 241c is fixedly connected to the second support member 241b, and a space D is provided between the two, which is used to accommodate a plurality of second wedge blocks 211 arranged in the circumferential direction, and guide the two axial end faces of the plurality of second wedge blocks 211 in the radial direction at the same time. In addition, the second support member 241b, the third support member 241c, and the plurality of second wedge blocks 211 also form an air cavity A, and the groove 215 is a part of the air cavity A. The first wedge block 210 can be pushed to move axially by inflating the air cavity A, thereby driving the plurality of second wedge blocks 211 to move radially outward. By evacuating the air cavity, the plurality of second wedge blocks 211 move radially inward and return to their original positions under the drive of the return spring.

[0040] like Figure 3 and Figures 6 to 9 As shown, the reverse package component 22 has an initial state and a reverse package state. Figure 3As shown, the turn-up assembly 22 can roll up the material 2 in the initial state. Figure 6 , Figure 7 As shown in , the turn-up action can be performed in the turn-up state. The turn-up assembly 22 includes an outer cylinder body 220 fixedly connected to the first support member 241a, a second piston 222 radially arranged between the outer cylinder body 220 and the second support member 241b and axially movable, a plurality of turn-up rods 221 arranged along the circumferential direction and pivotally connected to the second piston 222, and a base 223 connecting the second piston 222 and the plurality of turn-up rods 221. An air cavity is formed between the first support member 241a, the second support member 241b, and the outer cylinder body 220, and the second piston 222 is located in the air cavity and divides the air cavity into a third air cavity 224 and a fourth air cavity 225. In order to ensure the sealing of the air cavity, a sealing member 226 is provided on the first support member 241a, the second support member 241b, the outer cylinder body 220, and the second piston 222.

[0041] like Figures 6 to 9 As shown, the turn-up assembly 22 is provided with a first air passage 227 connected to the third air chamber 224, wherein the first air passage 227 is arranged on the first support member 241a. The turn-up assembly 22 is provided with a second air passage 228 connected to the fourth air chamber 225, wherein the second air passage sequentially passes through the first support member 241a, the second support member 241b and the second piston 222 to be connected to the second air passage 228. When the fourth air chamber 225 is not ventilated or evacuated, the gas enters the third air chamber 224 through the first air passage 227 to push the second piston 222 to move axially inward (toward the direction close to the middle drum 40), thereby pushing the base 223 and the plurality of turn-up rods 221 to move axially inward in turn, thereby facilitating the plurality of turn-up rods 221 to perform a turn-up action, and finally reaching a turn-up state. When the third air chamber 224 is not ventilated or is evacuated, the gas enters the fourth air chamber 225 through the second air channel 228 to push the second piston 222 to move axially outward (towards the direction away from the middle drum 40), thereby driving the base 223 and the plurality of turn-up rods 221 to move axially outward in turn, thereby causing the plurality of turn-up rods 221 to perform a reset action and finally return to the initial state.

[0042] like Figures 6 to 9 As shown, each turn-up rod 221 is provided with a turn-up roller 229 at one end facing the middle drum 40, and the other end of each turn-up rod 221 is pivotally connected to the base 223. Each turn-up rod 221 includes a main body extending along the axial direction and a bent portion bent radially inward relative to the main body. The turn-up roller 229 is connected to the bent portion to closely fit the rubber material 2 to be turned up onto the cylindrical rubber material 5. The second support member 241b is recessed with a guide groove R for accommodating the turn-up roller 229. Figures 6 to 9As shown, the turn-up assembly 22 further includes an adjusting member 22a disposed in the fourth air chamber 225. The adjusting member 22a has a certain axial length, one axial end face of which abuts against the cylinder body 220, and the other axial end face can abut against the second piston 222. When the second piston 222 moves axially until it abuts against the adjusting member 22a, the adjusting member 22a can limit the further axial movement distance of the second piston 222 by using its own length, so that it can be used to adjust the axial stroke of the second piston 222, and then adjust the axial strokes of a plurality of turn-up rods 221 to meet different turn-up stroke requirements.

[0043] like Figures 6 to 9 As shown, the turn-up assembly 22 further includes a guide member 22b sleeved on the second support member 241b, the guide member 22b is arranged opposite to the base 223, and is provided with a plurality of guide grooves (not shown) for receiving the turn-up rods 22b, so as to improve the accuracy of the turn-up route of the turn-up rods 221 or to reset the turn-up rods 221. If a turn-up rod 221 cannot accurately fall into the guide groove, the turn-up rod 221 must be higher than the cylindrical surface formed by the other turn-up rods 221, so that it is judged that the reset action of the turn-up rod 221 is not completed.

[0044] like Figure 3 , Figures 6 to 9 As shown, the cover plate assembly 23 is arranged at the radial periphery of the turn-up assembly 22, and fills the gaps between the turn-up rods 221 and shields the turn-up rollers 229 in the initial state of the turn-up assembly 22, so that the side drum 20 has a substantially closed cylindrical surface. The cover plate assembly 23 includes an annular base 230 arranged at the radial periphery of the turn-up assembly 22, a plurality of extensions 231 arranged at circumferential intervals and fixedly connected to the base 230, a driving mechanism 232 connected to the base 230, and a reset mechanism.

[0045] The driving mechanism 232 can drive the annular base 230 to move axially away from the middle drum 40, thereby exposing the concealed turn-up roller 229. Figure 8 , Fig. 9 The reset mechanism has elastic pressure. When the driving mechanism 232 does not act on the annular base 230, the elastic pressure of the reset mechanism can make the annular base 230 move axially inward (toward the direction close to the middle drum 40), so that one end of the extension portion 231 always abuts against the radial vertex of the guide groove R of the second support member 241b. For details, see Figure 4 , Figure 5 , thereby filling the gaps between the several turn-up rods 221 and shielding the turn-up roller 229. In this embodiment, the driving mechanism 232 is a cylinder mechanism or an electric cylinder mechanism. In other embodiments, the reset mechanism can be replaced by a cylinder mechanism or an electric cylinder mechanism to drive the base 230 to axially approach the middle drum 40.

[0046] like Figure 3 , Figures 6 to 9 As shown, in this embodiment, the driving mechanism 232 that drives the annular base 230 on one side axially away from the middle drum 40 is a two-cylinder structure, and similarly, the structure on the other side is consistent therewith. The output end of the driving mechanism 232 is fixedly connected to the base 230 by a fastening screw 234, and the seat of the driving mechanism 232 is fixed to the first support member 241a. Two reset mechanisms are provided on each cover plate assembly 23 to ensure that the elastic pressure is sufficient to make the plurality of extensions 231 abut against the radial vertices of the guide groove R of the second support member 241b. The two reset mechanisms and the two cylinder structures 232 are spaced apart from each other to avoid interference.

[0047] like Figure 3 , Figures 6 to 9 As shown, the reset mechanism includes a guide member 235 passing through the base 230 and fixedly connected to the first support member 241a, and an elastic member 233 arranged between the guide member 235 and the base 230, and the base 230 can move axially relative to the guide member 235. The elastic member 233 is a spring 233, which is always in a compressed state, so that it always has elastic pressure. In this embodiment, the guide member 235 is a long screw 235, which is threadedly fixed to the first support member 241a, and the annular base 230 is sleeved on the stud of the long screw 235 and can move on the stud. The elastic member 233 is sleeved on the stud of the long screw 235 and is axially located between the screw head of the long screw 235 and the base 230, so that the elastic pressure can directly act on the base 230. The long screw 235 and the first air channel 237 are staggered to avoid interference.

[0048] like Figure 3 , Figures 6 to 9 As shown, the cover plate assembly 23 also includes at least one guide belt 236 arranged on the radial inner side of the annular base 230, and the guide belt 236 is tightly attached to the outer cylinder body 220 of the turn-up assembly 22, and is used to reduce the friction between the base 230 and the outer cylinder body 220, that is, to reduce the friction between the cover plate assembly 23 and the turn-up assembly 22.

[0049] In summary, the tire building drum 1 of the present invention connects the screw nut pair 30 to the side drum 20, and connects the side drum 20 to the corresponding half drum 41 respectively, and at the same time, the two half drums 41 of the middle drum 40 are set to an axially embeddable structure, so that when the screw nut pair 30 is actuated, the two half drums 41 can be pushed to axially embed / move away from each other, so that the left half 1-1 and the right half 1-2 move relatively, thereby changing the distance between the drum shoulders of the middle drum 40, that is, the over-setting value of the tire process, to produce tires of different specifications, thereby improving the versatility of the tire building drum. And while the side drum 20 of the tire building drum 1 is connected to the corresponding half drum 41 through the shaft sleeve 50, the cylinder-like structure is used to axially move on the shaft sleeve 50 to move away from the corresponding half drum 41, so that a space is formed between the side drum 20 and the half drum 41, and the space can meet the positive packaging process in the secondary molding process, that is, the side of the newly bonded sidewall material that exceeds the edge of the middle drum 40 is positively packaged and rolled. In addition, the tire building drum of the present invention performs the turning-up process by providing a turn-up assembly 22 and a cover assembly 23, replacing the traditional bladder and bladder booster plate method, simplifying the structure of the tire building machine, reducing the time of the turning-up action, and improving the efficiency of forming the tire blank.

[0050] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0051] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tire building drum, comprising: A drum shaft, which is provided with a screw rod and two nuts arranged outside the screw rod; Two side drums are located on the drum shaft and are arranged opposite to each other; A middle drum, located between the two side drums, the middle drum comprising two half drums that can be axially embedded and matched with each other; Features: The tire building drum further comprises a sleeve disposed between each of the side drums and the drum shaft, one end of each sleeve being connected to the adjacent half-drum and the other end being connected to the corresponding side drum, and a portion of the side drum being movable axially along the sleeve to approach or move away from the adjacent half-drum; The two nuts are respectively connected to the two side drums, and when the screw rod rotates, the two nuts can respectively drive the corresponding side drum, the shaft sleeve, and the half drum to move relatively at the same time; Each of the side drums includes a turn-up assembly, which includes a cylinder body arranged on the radial periphery of the drum shaft, an axially movable second piston located on the radial inner side of the cylinder body, and a plurality of turn-up rods arranged along the circumferential direction and pivotally connected to the second piston. The turn-up assembly is used for turning up the rubber material attached to the plurality of turn-up rods.

2. The tire building drum according to claim 1, characterized in that: Each of the side drums further comprises a bead locking assembly disposed close to the half-drum and a driving assembly for driving the bead locking assembly and the turn-up assembly to move axially together; The driving assembly includes a support member for supporting the turn-up assembly and the tire bead locking assembly, and a first piston fixedly connected to one end of the sleeve, wherein the first piston is connected to the nut.

3. The tire building drum according to claim 2, characterized in that: The support member includes a first support member, a second support member connected to the first support member, and a third support member connected to the second support member. A closed air cavity is formed between the first support member, the second support member, and the sleeve. One end of the first piston is located in the air cavity, and the air cavity is divided into a first air cavity and a second air cavity.

4. The tire building drum according to claim 3, characterized in that: The tire bead locking assembly is located between the second support member and the third support member, and includes a first wedge block arranged around the drum shaft and a plurality of second wedge blocks circumferentially arranged between the second support member and the third support member. The first wedge block moves axially to abut against a plurality of the second wedge blocks to drive the plurality of the second wedge blocks to move radially and synchronously.

5. The tire building drum according to claim 3, characterized in that: An air cavity is formed between the first support member, the second support member and the cylinder body. The second piston is located in the air cavity and divides the air cavity into a third air cavity and a fourth air cavity.

6. The tire building drum according to claim 5, characterized in that: The turn-up assembly is provided with a first air passage connected to the third air chamber, the first air passage passes through the first support member, and gas can enter the third air chamber from the first air passage to push the second piston; The turn-up component is provided with a second air passage connected to the fourth air cavity. The second air passage passes through the first support member, the second support member and the second piston. Gas can enter the fourth air cavity from the second air passage to push the second piston.

7. The tire building drum according to any one of claims 1 to 6, characterized in that: Each of the turn-up rods comprises a main body portion extending along the axial direction and a bent portion bent radially inward relative to the main body portion, and a turn-up roller is provided at one end of the bent portion.

8. The tire building drum according to claim 6, characterized in that: The turn-up assembly further includes an adjusting member disposed in the fourth air chamber. The adjusting member has a certain axial length and can abut against the second piston to limit the axial movement distance of the second piston.

9. The tire building drum according to claim 6, characterized in that: The turn-up assembly also includes a guide member arranged on the second support member and a base connecting the second piston and the plurality of turn-up rods. The guide member is arranged opposite to the base, and a guide groove for accommodating the plurality of turn-up rods is provided on the guide member.

10. The tire building drum according to claim 3, characterized in that: The first support member, the second support member, the cylinder body and the second piston are all provided with sealing members.

11. The tire building drum according to claim 2, characterized in that: Each of the side drums also includes a cover plate assembly for shielding a portion of the turn-up assembly, the cover plate assembly including a base arranged at the radial periphery of the turn-up assembly, a plurality of extensions arranged at circumferential intervals and fixedly connected to the base, and a driving mechanism connected to the base and driving the base axially away from the middle drum.

12. The tire building drum according to claim 11, characterized in that: Each of the cover plate assemblies also includes a reset mechanism that can drive the base to reset, the reset mechanism includes a fixing member that passes through the base of the cover plate assembly and is fixedly connected to the support member, and an elastic member arranged between the fixing member and the base of the cover plate assembly, and the base can move axially relative to the fixing member.

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