Tire building drum

Abstract

The present invention discloses a tire building drum, comprising: a hollow main shaft, on which a first slot and a second slot are provided; two oppositely arranged half drums, each half drum including a mounting disc, a bead turning unit located on the mounting disc, and a driving unit, the bead turning unit including a support disc located axially inside the mounting disc; a driving assembly and a bead turning synchronization unit located inside the main shaft, the driving assembly being capable of driving the two half drums to move relatively or away from each other along the axial direction of the main shaft; a first connecting member connecting the mounting discs of each half drum and capable of passing through the first slot to connect the driving assembly; a second connecting member connecting the support disc and capable of passing through the second slot to connect the bead turning synchronization unit; the first connecting member moves radially along the main shaft to connect or disengage from the driving assembly, and the second connecting member moves radially along the main shaft to connect or disengage from the bead turning synchronization unit. The present invention can quickly disassemble and assemble the two half drums, thereby quickly replacing half drums of different sizes and reducing the cost of producing tire blanks of different sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of tire forming, and particularly to a tire forming drum applied to a tire forming machine. Background Art

[0002] A tire forming drum for forming a tire generally includes a drum shaft and two half drums arranged on the drum shaft, and the two half drums are arranged symmetrically basically. The tire forming drum needs to complete processes such as rotary coiling, reverse wrapping of the tire side, and embryo shaping. Generally, the half drum is provided with a reverse wrapping mechanism and is pneumatically driven. However, since the gas is introduced from one side of the tire forming drum, it takes a certain amount of time for the gas to reach the other side of the tire forming drum. Therefore, the half drum that is first introduced with gas to drive the reverse wrapping module will perform the reverse wrapping action first, and the reverse wrapping action of the half drum that is later introduced with gas to drive the reverse wrapping module will lag. The inconsistent reverse wrapping actions of the two half drums will result in poor reverse wrapping process of the tire embryo and form waste tires.

[0003] To solve the above problems, the existing solutions generally set a synchronous rod with spiral grooves in the drum shaft, and corresponding pins are respectively arranged on the two half drums and extend into the spiral grooves, so as to ensure that the two half drums perform reverse wrapping synchronously. However, in the axial direction, the pins are located inside the axial direction of the reverse wrapping mechanism. Therefore, when replacing the half drum, a part of the reverse wrapping rod of the reverse wrapping mechanism needs to be removed first to take out the pins, and then the half drum can be removed. Therefore, it is not convenient to disassemble the half drum, and the structure of the tire forming drum becomes more complex. When the forming machine needs to produce tire blanks of different sizes, different-sized tire forming drums need to be replaced. However, the tire forming drums with synchronous mechanisms generally need to be replaced as a whole drum, which is not easy to operate, time-consuming and laborious, and each tire forming drum must be equipped with a drum shaft and its related parts, resulting in a high cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a tire forming drum with a reverse wrapping synchronous unit, and the two half drums of the tire forming drum can be quickly fixed to the drum shaft or removed from the drum shaft.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: A tire forming drum, characterized in that the tire forming drum includes:

[0006] A main shaft, the main shaft is hollow, and is provided with a first slot and a second slot thereon;

[0007] Two relatively arranged half drums, each half drum includes a mounting disc sleeved on the main shaft, a reverse wrapping unit located inside the axial direction of the mounting disc, and a driving unit for driving the reverse wrapping unit to perform reverse wrapping. The reverse wrapping unit includes a support disc sleeved on the main shaft and located inside the axial direction of the mounting disc;

[0008] A reverse wrapping synchronous unit, located inside the main shaft, connecting the reverse wrapping units of the two half drums;

[0009] A driving component, located inside the main shaft, is capable of driving the two half drums to move relatively or away from each other along the axial direction of the main shaft;

[0010] A first connecting member, fixedly connecting the mounting disc of each half drum, and capable of passing through the first slot to connect with the driving component;

[0011] A second connecting member, fixedly connecting the support disc, and capable of passing through the second slot to connect with the reverse wrapping synchronization unit;

[0012] The first connecting member moves radially along the main shaft to connect with or disengage from the driving component, and the second connecting member moves radially along the main shaft to connect with or disengage from the reverse wrapping synchronization unit.

[0013] Further, the second connecting member is located axially outside the mounting disc. The mounting disc includes a relief hole. The support disc protrudes towards the first connecting member with a second fixing block. The second fixing block passes through the relief hole and is fixedly connected to the support disc. The second fixing block is provided with a through hole for fixing the second connecting member.

[0014] Further, the mounting disc protrudes towards the first connecting member with a first fixing block. The first fixing block is provided with a through hole for the first connecting member to pass through and be fixed.

[0015] Further, the driving component includes a lead screw coaxially arranged with the main shaft and two nut members sleeved on the lead screw and axially movable on the lead screw. The two nut members are respectively connected to the corresponding first connecting members.

[0016] Further, the first connecting member is a pin shaft. The two pin shafts are arranged oppositely. When the pin shaft is screwed, the pin shaft can be locked to connect with the nut member or loosened from the nut member.

[0017] Further, the first connecting member and the second connecting member are located in the same radial plane. The two second connecting members of each half drum are spaced from the two first connecting members. In the radial cross-section of the main shaft, the second connecting member and the first connecting member are adjacent and the included angle is distributed at 90°.

[0018] Further, the reverse wrapping synchronization unit includes a first synchronization rod group and a second synchronization rod group, an adapter connecting the second connecting member to the first synchronization rod group or the second synchronization rod group, a first support member and a second support member disposed in the main shaft and used for supporting the first synchronization rod group and the second synchronization rod group, and two rotating members. The first synchronization rod group includes two relatively arranged first synchronization rods, and one of the rotating members meshes with the two first synchronization rods. The second synchronization rod group includes two relatively arranged second synchronization rods, and the other rotating member meshes with the two second synchronization rods.

[0019] Further, the second connecting member is a pin shaft. The two pin shafts are relatively arranged. When the pin shaft is screwed, the pin shaft can lock and connect the adapter or loosen the adapter.

[0020] Further, the first support member is located between the two half drums to support and guide one end of the synchronization rod away from the adapter, and the second support member is located between the adapter and the first support member to support and guide the middle region of the synchronization rod.

[0021] Further, the first support member and the second support member are both provided with a first guiding hole and a second guiding hole. The lead screw can pass through the first guiding hole, and the synchronization rod can pass through the second guiding hole.

[0022] Further, the first support member is provided with a relief groove for avoiding the rotating member.

[0023] Advantages of the present invention: The mounting disc of each half drum is connected to the driving component in the drum shaft through the first connecting member, and each half drum is connected to the synchronous reverse wrapping unit in the drum shaft through the second connecting member. Therefore, by removing the first connecting member and the second connecting member, the two half drums can be separated from the synchronous reverse wrapping unit and the driving component in the drum shaft, so that the two half drums on the drum shaft can be quickly removed without removing other components of the tire building drum, thereby making it convenient and fast to replace half drums with different radial dimensions, and reducing the cost of forming tire embryos of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is a cross-sectional view of the tire building drum provided by the present invention.

[0026] Figure 2 is Figure 1 an enlarged schematic view of part B in

[0027] Figure 3 is Figure 1 An enlarged schematic view of part C in

[0028] Figure 4 A schematic view of the drum shaft of the tire building drum and the parts inside the drum shaft.

[0029] Figure 5 is Figure 4 The A-A cross-sectional view in

[0030] Figure 6A A schematic view of the cooperation of the turn-up unit, the support disc and the turn-up synchronization unit, where the turn-up rod is in the initial state.

[0031] Figure 6B A schematic view of the cooperation of the turn-up unit, the support disc and the turn-up synchronization unit, where the turn-up rod is in the turn-up state.

[0032] Figure 7 A cross-sectional view at the symmetry line of the two half drums of the tire building drum.

[0033] Figure 8 A schematic view of the mutual cooperation between part of the drum shaft and the parts inside the drum shaft.

[0034] Figure 9 is Figure 8 The projection view at the right end in

[0035] Figure 10 A combined schematic view between the tire building drum provided by the present invention and the driving device for driving the tire building drum. Detailed implementation manners

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific implementation manners.

[0038] As Figures 1 to 3 , Figure 10 shown, the present invention provides a tire building drum 100 and a driving device 200 capable of driving the tire building drum 100. Specifically, the tire building drum 100 includes a hollow main shaft 10, two substantially symmetric half drums 20 sleeved on the main shaft 10, a driving assembly 30 for driving the two half drums 20 to move relatively or away from each other along the axial direction of the main shaft 10, and a plurality of first connecting members 40 connecting the driving assembly 30 and the half drums 20.

[0039] Among them, the driving component 30 includes a lead screw 31 located inside the main shaft 10 and coaxially arranged with the main shaft 10, and two nut members 32 sleeved on the lead screw 31 and axially movable on the lead screw 31. The lead screw 31 has two thread segments with the same pitch but opposite threads (not shown), and the two nut members 32 are respectively located on the two thread segments. In this way, when the lead screw 31 rotates, it can drive the two nut members 32 to move axially relative to or away from each other along the main shaft 10.

[0040] As Figures 1 to 5 shown, a plurality of first connecting members 40 extend into the main shaft 10 in the radial direction of the tire building drum 100. One end of each first connecting member 40 is connected to the nut member 32, and the other end of each first connecting member 40 is connected to the half drum 20. Through the first connecting member 40, the connection between the half drum 20 and the nut member 32 is achieved. As Figures 4 to 5 shown, first slots 11 are provided on the main shaft 10 corresponding to the positions of the two half drums 20. In this way, the first connecting member 40 can pass through the slot 11 of the main shaft 10 in the radial direction and be connected to the nut member 32. The slot 11 has a predetermined axial length, so as to allow the first connecting member 40 to move axially along the main shaft 10 within the length range of the slot 11. When the lead screw 31 rotates, the two nut members 32 move axially along the lead screw 31, thereby driving the first connecting member 40 and the two half drums 20 to move axially relative to or away from each other along the main shaft 10 in sequence. In this way, the conversion of the tire building drum 100 between the flat width state and the shaped width state can be realized.

[0041] As Figure 1 shown, in a preferred embodiment, in order to ensure the stable connection between the half drum 20 and the driving component 30, each half drum 20 is provided with two first connecting members 40, and two first slots 11 are also correspondingly provided on the main shaft 10. Among them, the two first connecting members 40 and the two first slots 11 are symmetrically distributed in the circumferential direction of the main shaft 10. When the first connecting member 40 moves radially inward or outward along the main shaft 10, the first connecting member 40 can be connected to or disengaged from the driving component 30. Specifically, the first connecting member 40 can be a pin shaft, a screw, or other structures. When the first connecting member 40 reaches a certain position radially inward, the first connecting member 40 can be connected to the corresponding nut member 32; when the first connecting member 40 reaches a certain position radially outward, the first connecting member 40 can be disengaged from the corresponding nut member 32.

[0042] As Figure 1As shown, each half-drum 20 includes a mounting disk 21 sleeved on the main shaft 10 and located on its side edge, a bead support unit 22 located axially inside the main shaft 10, a turn-up unit 23 located axially outside the main shaft 10, and a driving unit 24 for driving the turn-up unit 23 to perform a turn-up action. The mounting disk 21 protrudes a first fixing block 21a towards the first connecting member 40, and a through hole 21a1 through which the first connecting member 40 can pass is provided on the first fixing block 21a. The first fixing block 21a and the mounting disk 21 can be integrally formed or fixedly connected separately. The bead support units 22 of the two half-drums 20 have the same structure and can be lifted or lowered radially. When the bead (not shown) is located radially outside the bead support unit 22, if the bead support unit 22 is lifted radially, the bead can be locked, and if the bead support unit 22 is lowered radially, the bead can be unlocked.

[0043] As Figure 1 and Figure 6A , Figure 6B shown, the turn-up unit 23 includes a support disk 23a sleeved on the main shaft 10 and located axially inside the mounting disk 21, and a set of turn-up arms 23b arranged around the main shaft 10 and extending along the axial direction of the main shaft 10. Among them, one end of the turn-up arm 23b is a free end, and the other end is pivotally connected to the support disk 23a. The free end of the turn-up arm 23b is pivotally connected to a turn-up roller 23c. The driving unit 24 is similar to a cylinder structure. When gas is introduced into the driving unit 24, the support disks 23a of the two half-drums 20 can be driven to move axially inward relative to each other, so that the free end of the turn-up arm 23b can rotate around the pivot end pivotally connected to the support disk 23a, and then the turn-up roller 23c moves axially and radially along with the free end to turn up the material (not shown) on the upper part of the tire building drum 100.

[0044] As Figures 1 to 3 and Figures 7 to 8 shown, the tire building drum 100 further includes a turn-up synchronization unit 25 arranged inside the main shaft 10, and a plurality of second connecting members 60 connecting the turn-up synchronization unit 25 and the turn-up units 23 on the two half-drums 20. Further, second slots 14 through which the second connecting members 60 can pass are provided on the main shaft 10 corresponding to the positions of the two half-drums 20.

[0045] Specifically, the second connecting member 60 is disposed on the axial outer side of the mounting plate 21 and one end thereof is fixedly connected to the support plate 23a of the reverse wrapping unit 23. The support plate 23a protrudes toward the second connecting member 60 with a second fixing block 23a1, and a through hole (not shown) for the radial extension of the second connecting member 60 is provided on the second fixing block 23a1. The second fixing block 23a1 and the support plate 23a can be integrally formed or fixedly connected separately. The other end of the second connecting member 60 can be fixedly connected to the reverse wrapping synchronization unit 25. When the second connecting member 60 moves radially inward or outward along the main shaft 10, the second connecting member 60 can connect to or disengage from the reverse wrapping synchronization unit 25.

[0046] Specifically, the reverse wrapping synchronization unit 25 includes two sets of synchronizing rods arranged oppositely, a rotating member 25e located between each set of synchronizing rods, a first support member 25c disposed in the main shaft 10 and used for supporting the synchronizing rods, and two second support members 25d.

[0047] Specifically, the two synchronizing rod groups of the reverse wrapping synchronization unit 25 include a first synchronizing rod group and a second synchronizing rod group. Among them, the first synchronizing rod group includes two first synchronizing rods 25f arranged oppositely, and the second synchronizing rod group includes two second synchronizing rods 25g arranged oppositely. Correspondingly, the reverse wrapping synchronization unit 25 also includes two rotating members 25e, one of the rotating members 25e is located between the two first synchronizing rods 25f and meshes with the two first synchronizing rods 25f, and the other rotating member 25e is located between the two second synchronizing rods 25g and meshes with the two second synchronizing rods 25g. The first synchronizing rod group and the second synchronizing rod group are respectively located on both sides of the lead screw 31 and are spaced apart from the lead screw 31. In this embodiment, the first synchronizing rod 25f and the second synchronizing rod 25g are of rack structure, and the rotating member 25e is of gear structure. In an alternative embodiment, the reverse wrapping synchronization unit 25 may also include only one set of synchronizing rods arranged oppositely.

[0048] As Figure 2 shown, the mounting plate 21 is axially disposed outside the support plate 23a, and an axially extending relief hole 21b is provided on the mounting plate 21. Due to the existence of the relief hole 21b, the second fixing block 23a1 can pass through the mounting plate 21 for axial movement, so that the axial movement of the first synchronizing rod 25f and the second synchronizing rod 25g of the reverse wrapping synchronization unit 25 can be realized. In this embodiment, the reverse wrapping synchronization unit 25 further includes an adapter 25b connecting the second connecting member 60 and the synchronizing rod. Each second connecting member 60 can be connected to the corresponding first synchronizing rod 25f or second synchronizing rod 25g through an adapter 25b. In other alternative embodiments, the adapter 25b and the first synchronizing rod 25f or the second synchronizing rod 25g can be integrally formed, that is, the adapter 25b is provided as a part of the first synchronizing rod 25f or the second synchronizing rod 25g. In this embodiment, the second connecting member 60 can be a pin shaft or a screw.

[0049] In order to improve the stability of the tire building drum 100 during rotation, in this embodiment, the two first connectors 40 and the two second connectors 60 are located in the same radial plane and are arranged at intervals of two. The two first connectors 40 are aligned in the diameter direction of the main shaft, and the two second connectors 60 are also aligned in the diameter direction of the main shaft 10. Thus, on the radial section of the main shaft 10, the second connector 60 is adjacent to the first connector 40 and the included angle is generally distributed at 90°. Such a setting of the first connector 40 and the second connector 60 enables the axial length of the tire building drum 100 to be reduced, thereby reducing the installation space of the tire building drum 100. At the same time, since the first connector 40 and the second connector 60 are located in the same plane, such a setting also makes it more convenient for the operator to install or disassemble the half drum 20.

[0050] As Figure 1 , Figure 2 , Figure 6A and Figure 6B shown, the adapter 25b is generally L-shaped and includes a radial part and an axial part. The radial part extends into the second slot 14, and the axial part is connected to the first synchronizing rod 25f or the second synchronizing rod 25g. As Figure 9 shown, there is a gap between the radial inner side surface of the adapter 25b and the lead screw in the main shaft 10 to prevent interference between the adapter 25b and the first synchronizing rod 25f and the second synchronizing rod 25g connected to the adapter 25b and the lead screw 31. Both the first synchronizing rod 25f and the second synchronizing rod 25g can be strip-shaped. One end of each is fixedly connected to the adapter 25b, and the other end extends along the axial direction of the main shaft 10 and can be engaged with the rotating member 25e. Axially continuously distributed teeth are provided on the opposite surfaces of the two first synchronizing rods 25f or the second synchronizing rods 25g to engage with the rotating member 25e. In this embodiment, two symmetrically arranged synchronizing rod groups are provided to ensure the weight symmetry between the upper half and the lower half of the tire building drum 100. Thus, when the tire building drum 100 rotates, it will not shake due to excessive local weight, improving the stability of the tire building drum 100. In addition, if only one synchronizing rod group is provided on the tire building drum 100, the meshing force between the first synchronizing rod 25f and the rotating member 25e is less than the pneumatic driving force of the driving unit 24, which will cause misalignment between the first synchronizing rod 25f and the rotating member 25e. Therefore, the tire building drum 100 in this embodiment is provided with two synchronizing rod groups, so that the pneumatic driving force of the driving unit 24 is less than or equal to the sum of the meshing forces between the two synchronizing rod groups and the rotating member 25e, thereby ensuring the normal operation of the reverse wrapping synchronization unit 25. As Figure 5 and Figure 8As shown, the first synchronization rod 25f of the left half drum 20 and the first synchronization rod 25f of the right half drum 20 are parallel to each other and spaced a certain distance apart, and the rotating member 25e is located within the distance to respectively engage the first synchronization rods 25f of the two half drums 20, so that the turn-up units 23 of the two half drums 20 are synchronously connected through the rotating member 25e and the first synchronization rod 25f. When the turn-up unit 23 of the half drum 20 on one side moves axially, it drives the corresponding synchronization rod on this side to move axially, and then drives the rotating member 25e, the corresponding synchronization rod of the half drum 20 on the other side, and the half drum 20 on the other side to move synchronously relative to each other.

[0051] like Figure 5 , Figure 7 and Figure 8 As shown, the rotating member 25e includes a fixed shaft 25e1 and a gear 25e2 pivotably mounted on the fixed shaft 25e1. One end of the fixed shaft 25e1 is fixed to the main shaft 10, and the other end extends radially inward toward the first support member 25c along the main shaft 10. The gear 25e2 is fixed to the radial inner end of the fixed shaft 25e1, and the gear 25e2 can rotate around the fixed shaft 25e1 under the driving force. The gear 25 is located between the inner wall surface of the main shaft 10 and the outer edge of the first support member 25c in the radial direction.

[0052] In order to ensure the stability of the synchronization rod during axial movement, the first support member 25c and the second support member 25d can be used to support the slender synchronization rod. Figure 8 As shown, the first support member 25c is axially located between the two half drums 20, and is used to support and guide the axial movement of the synchronization rod. The second support member 25d is located between the adapter 25b and the first support member 25c, so that the middle area of the synchronization rod can be supported and guided to prevent the support rod from shaking during movement due to its excessive length. Figure 7 As shown, the first support member 25c and the second support member 25d are both provided with a first guide hole 25h and a second guide hole 25i. The screw rod 31 can pass through the first guide hole 25h, and the synchronization rod can pass through the second guide hole 25i. The inner wall of the first guide hole 25h can slide in contact with the outer circumferential wall of the screw rod 31 to support and guide the screw rod 31, and the inner wall of the second guide hole 25i can slide in contact with the outer circumferential wall of the synchronization rod to support and guide the synchronization rod. When the second connecting member 60 is disassembled, since the synchronization rod is supported by the first support member 25c and the second support member 25d, the synchronization rod and the adapter 25b fixed to one end of the synchronization rod will not sag or fall, and naturally will not damage other components in the main shaft 10. Similarly, when the first connecting member 40 is disassembled, the screw rod 31 is supported by the first support member 25c and the second support member 25d, so the screw rod 31 and the nut member 32 fixed on the screw rod 31 will not sag and interfere with the main shaft 10 or the synchronization rod.

[0053] like Figure 7 andFigure 8 As shown, both the first support member 25c and the second support member 25d are fixed to the main shaft 10 by pins or screws, preventing the first support member 25c and the second support member 25d from sliding or rotating relative to the main shaft 10 and causing misalignment of the synchronizing rod. A relief groove 25j is also provided at the position of the first support member 25c corresponding to the rotating member 25e to prevent interference between the rotating member 25e and the first support member 25c during rotation.

[0054] The following describes the reverse wrapping synchronous movement process of the tire building drum 100 of the present invention in detail as follows:

[0055] When the drive unit 24 on the tire building drum 100 drives the support discs 23a of the two half drums 20 to move axially along the main shaft 10, the support discs 23a drive the second connecting member 60, the adapter member 25b, and the synchronizing rod to move axially along the main shaft 10 in sequence. Since the first synchronizing rod 25f and the second synchronizing rod 25g of the two half drums 20 are both engaged with the rotating member 25e, the first synchronizing rod 25f or the second synchronizing rod 25g of the half drum 20 that moves axially first will inevitably drive the first synchronizing rod 25f or the second synchronizing rod 25g of the other half drum 20 that moves axially later to move axially together, thereby realizing the axial synchronous movement of the support discs 23a of the two half drums 20. The reverse wrapping arms 23b of the two half drums 20 are pivotally connected to the corresponding support discs 23a. When the support discs 23a move synchronously, the reverse wrapping arms 23b pivotally connected to the support discs 23a of the corresponding half drums 20 can surely perform the reverse wrapping action synchronously.

[0056] When the lead screw 31, the nut member 32, the first support member 25c, the second support member 25d, the synchronizing rod, the adapter member 25b, the rotating member 25e, etc. in the main shaft 10 are all installed, the quick installation process of the half drum 20 of the tire building drum 100 is as follows:

[0057] The right half drum 20 is sleeved on the designated position of the main shaft 10 correspondingly. The first connecting member 40 is screwed to be tightened to connect to the nut member 32 on the lead screw 31, and the second connecting member 60 is screwed to be tightened to connect to the adapter member 25b. The installation process of the left half drum 20 is the same as that of the right half drum 20.

[0058] The quick disassembly process of the half drum 20 of the tire building drum 100 is as follows:

[0059] The first connecting member 40 of the left half drum 20 is screwed to disengage from the nut member 32 on the lead screw 31, and the second connecting member 60 is screwed to disengage from the adapter member 25b. The left half drum 20 is moved axially along the drum axis and removed. The disassembly process of the right half drum 20 is the same as that of the left half drum 20.

[0060] Therefore, the quick installation or disassembly of the two half-drums 20 of the tire building drum 100 can be achieved by installing and disassembling the first connecting member 40 and the second connecting member 60. The tire building drum 100 provided by the present invention can achieve the quick disassembly and assembly of the half-drum 20. Thus, it provides the condition for quickly replacing half-drums of different sizes, and then different-sized tire embryos can be formed.

[0061] As Figure 1 and Figure 10 shown, the present invention also discloses a driving device 200 of the tire building drum 100. Specifically, the driving device 200 is located in a forming machine case (not shown). Among them, the lead screw 31 and the main shaft 10 of the tire building drum 100 extend into the driving device 200 of the forming machine case. The driving device 200 includes a base 201 and a first driving motor 202 and a second driving motor 203 fixed on the base 201. Specifically, the output end of the first driving motor 202 is connected to the lead screw 31 to drive the lead screw 31 to rotate, and the second motor 203 is connected to the main shaft 10 through a synchronous pulley to drive the main shaft 10 to rotate. The main shaft 10 includes an integrally formed first shaft section 12 and a second shaft section 13. The first section 12 is basically located outside the forming machine case, and the second section 13 is basically located inside the forming machine case. Further, the two half-drums 20 are arranged on the first shaft section 12, and the second shaft section 13 is located on the base 201 of the driving device 200 and is connected to the synchronous belt. The two nut members 32 move on the lead screw 31 within the axial length range corresponding to the first shaft section 12. The main shaft 10 of the tire building drum 100 of the present invention is a single component, and the first shaft section 12 and the second shaft section 13 of the main shaft 10 are integrally formed. Therefore, since the main shaft 10 is an independent component, the coaxiality of the main shaft 10 is good, the axis of the first shaft section 12 and the axis of the second shaft section 13 are the same axis, and the stability of the main shaft 10 during rotation is improved. Thus, it solves the problem that the coaxiality of the segmented-connected main shaft deteriorates after a period of operation in the prior art and the problem that timely calibration is required.

[0062] In the description of the specific embodiments, the descriptive terms such as "in this embodiment", "in an embodiment", "in a specific embodiment", etc. mean that the specific features or characteristics described in connection with the embodiment are included in at least one embodiment of the present invention. And in the specific embodiments, the schematic expressions of the above terms do not necessarily refer to the same embodiment. Moreover, the specific features or points described can be combined in a suitable manner in any one or more embodiments.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A tire building drum, characterized in that, The tire building drum comprises: A main shaft, wherein the main shaft is hollow and is provided with a first slot and a second slot; Two half-drums arranged opposite to each other, each half-drum comprising a mounting plate sleeved on the main shaft, a turn-up unit located axially inside the mounting plate, and a driving unit for driving the turn-up unit to turn up, the turn-up unit comprising a supporting plate sleeved on the main shaft and located axially inside the mounting plate; A turn-up synchronization unit, located in the main shaft, connecting the turn-up units of the two half drums; A driving assembly, located in the main shaft, capable of driving the two half-drums to move relative to or away from each other along the axial direction of the main shaft; at least two first connecting members fixedly connected to the mounting plate of each half-drum and capable of passing through the first slot to connect to the drive assembly; At least two second connecting members, fixedly connected to the support plate and capable of passing through the second slot to connect to the turn-up synchronization unit; The first connecting member moves along the radial direction of the main shaft to connect or disconnect the driving assembly, and the second connecting member moves along the radial direction of the main shaft to connect or disconnect the turn-up synchronization unit; The second connecting member is located axially outside the mounting plate, the mounting plate includes a clearance hole, the supporting plate has a second fixing block protruding toward the first connecting member, the second fixing block passes through the clearance hole and is fixedly connected to the supporting plate, and the second fixing block is provided with a through hole for fixing the second connecting member; The first connecting member and the second connecting member are located in the same radial plane, the two second connecting members of each half drum are spaced apart from the two first connecting members, and on the radial section of the main shaft, the second connecting member is adjacent to the first connecting member and the included angle is 90°.

2. The tire building drum according to claim 1, wherein A first fixing block protrudes from the mounting plate toward the first connecting member, and the first fixing block is provided with a through hole for fixing the first connecting member therethrough.

3. The tire building drum according to claim 1, characterized in that, The driving assembly includes a screw rod coaxially arranged with the main shaft and two nut members sleeved on the screw rod and axially movable on the screw rod, and the two nut members are respectively connected to the corresponding first connecting members.

4. The tire building drum according to claim 3, wherein, The first connecting member is a pin, and the two pins are arranged opposite to each other. When the pins are screwed, the pins can lock and connect the nut member or loosen the nut member.

5. The tire building drum according to claim 3, wherein, The turn-up synchronization unit includes a first synchronization rod group and a second synchronization rod group, an adapter connecting the second connecting member and the first synchronization rod group or the second synchronization rod group, a first support member and a second support member arranged in the main shaft and used to support the first synchronization rod group and the second synchronization rod group, and two rotating members, the first synchronization rod group includes two oppositely arranged first synchronization rods, one of the rotating members is engaged with the two first synchronization rods, the second synchronization rod group includes two oppositely arranged second synchronization rods, and the other of the rotating members is engaged with the two second synchronization rods.

6. The tire building drum according to claim 5, characterized in that, The second connecting member is a pin shaft, and the two pin shafts are arranged opposite to each other. When the pin shafts are screwed, the pin shafts can lock and connect the adapter or release the adapter.

7. The tire building drum according to claim 5, characterized in that, The first support member is located between the two half drums to support and guide one end of the synchronizing rod away from the adapter, and the second support member is located between the adapter and the first support member to support and guide the middle region of the synchronizing rod.

8. The tire building drum according to claim 7, wherein Both the first support member and the second support member are provided with a first guide hole and a second guide hole. The lead screw can pass through the first guide hole, and the synchronizing rod can pass through the second guide hole.

9. The tire building drum according to claim 5, characterized in that, The first support member is provided with a relief groove for avoiding the rotating member.

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