Tire building drum

Abstract

The present invention discloses a tire building drum, which comprises a main shaft and two half drums arranged around the main shaft. Each half drum includes an interlocking device and an overturning unit pivotally connected to the interlocking device at one end. The interlocking device includes a first locking mechanism and a second locking mechanism sleeved on the main shaft. The first locking mechanism includes a pressing member and a first cylinder body arranged around the main shaft from the inside to the outside in sequence. The first cylinder body is provided with a first cavity, a force transmission medium is arranged in the first cavity, and the first cavity extends towards the pressing member. The first locking mechanism further includes a first piston received in the first cavity. The first piston can axially or radially move in the first cavity to compress the force transmission medium to generate pressure, and the pressure acts on the pressing member to lock the main shaft. By forming an alternating interlocking structure through the first locking mechanism and the second locking mechanism, the present invention can complete the overturning and shaping processes, simplify the structure of the building drum, and optimize the shaping effect.

Description

Technical Field

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

[0002] For the existing tire forming drum for one-step forming, such as the tire forming drum disclosed in Chinese Invention Patent No. CN201080001988.3 of VMI Holland B.V. This tire forming drum is provided with two lead screws. One lead screw drives a set of nested push-pull rods to achieve the push-pull movement of the push-pull rods through the opposite thread directions of the lead screw, so as to achieve the relative movement of the two half drums. The other lead screw also drives another set of nested push-pull rods through the opposite thread directions of the lead screw, so as to achieve the push-pull movement of the push-pull rods and thus achieve the reverse wrapping action of the two sets of reverse wrapping rods. This structure requires four push-pull rods that are nested with each other and coaxially arranged, and two independently controlled lead screws, and both the push-pull rods and the lead screws are located inside the main chassis. Therefore, the structure of this tire forming drum is complex, the interchangeability and versatility of the entire forming machine are poor, and the control of the reverse wrapping action and shaping action during tire forming by the tire forming drum is cumbersome. Summary of the Invention

[0003] The purpose of the present invention is to provide a tire forming drum with a simple structure and convenient control.

[0004] To achieve this purpose, the present invention adopts the following technical solutions: A tire forming drum, comprising: a main shaft, a lead screw located inside the main shaft, two half drums arranged around the main shaft, and connection components that respectively connect the two half drums to the lead screw.

[0005] Each half drum includes an outer shaft sleeve sleeved on the main shaft, an interlocking device, and a reverse wrapping unit pivotally connected to one end of the interlocking device. The interlocking device includes a first locking mechanism sleeved on the main shaft and fixed to one end of the outer shaft sleeve, and a second locking mechanism sleeved on the outer shaft sleeve. When the first locking mechanism locks the main shaft, the second locking mechanism synchronously releases the outer shaft sleeve; when the first locking mechanism releases the main shaft, the second locking mechanism synchronously locks the outer shaft sleeve, and the connection component is fixedly connected to the second locking mechanism.

[0006] The first locking mechanism includes a pressing member and a first cylinder body sequentially arranged around the main shaft from the inside to the outside. The first cylinder body is provided with a first cavity, the first cavity has a force transmission medium, and the first cavity extends towards the pressing member. The first locking mechanism further includes a first piston received in the first cavity. The pressing member and the first piston can move in the first cavity to compress the force transmission medium to generate pressure, and the pressure acts on the pressing member to lock the main shaft.

[0007] Furthermore, the force transmission medium is liquid plastic.

[0008] Furthermore, the second locking mechanism has the same structure as the first locking mechanism.

[0009] Further, the first cylinder body includes a first inner cylinder body and a first outer cylinder body, and the first inner cylinder body and the first outer cylinder body cooperate with each other to form a first cavity.

[0010] Furthermore, the pressing member is provided with a radially recessed groove, and the first cavity is communicated with the groove.

[0011] Furthermore, the first locking mechanism also includes a first elastic member located between the main shaft and the pressing member, and the pressure causes the pressing member to press against the first elastic member, and the first elastic member holds the main shaft tightly after being deformed.

[0012] Furthermore, the first piston divides the first cavity into a first chamber and a second chamber, the second chamber extends toward the pressure member and the force transmission medium is located in the second chamber, and the first piston can move radially in the first chamber to compress the force transmission medium in the second chamber.

[0013] Furthermore, the first piston includes a first part and a second part, the first part and the second part divide the first cavity into a first chamber, a second chamber and a third chamber, the second chamber extends toward the pressure member, the second part and the force transmission medium are both located in the second chamber, and the first part is located in the first chamber and the third chamber.

[0014] Furthermore, the first part is provided with a recessed portion which is clamped with one end of the second part, and the recessed portion can limit one end of the second part. The first part pushes the second part to move axially along the main axis through the recessed portion to compress the force transmission medium in the second chamber.

[0015] Furthermore, the second locking mechanism includes a second elastic member and a second cylinder body which are arranged around the outer sleeve and in sequence from the inside to the outside, and the second cylinder body is clamped at two ends of the second elastic member.

[0016] Furthermore, a second cavity is formed between the second elastic member and the second cylinder body, and a second piston is accommodated in the second cavity. The second piston can be driven by gas or liquid to move axially along the main shaft.

[0017] Furthermore, the second elastic member is composed of two conical members arranged around the outer sleeve, the conical members are semi-circular rings, a gap is provided between the two semi-circular rings, and the semi-circular rings are matched with the conical surface of the second piston.

[0018] Furthermore, the release control of the first locking mechanism and the locking control of the second locking mechanism are realized by the same pneumatic source or hydraulic source, and the locking control of the first locking mechanism and the release control of the second locking mechanism are realized by the same pneumatic source or hydraulic source.

[0019] Furthermore, the connecting assembly includes two drive nuts respectively located on both sides of the lead screw and threadedly connected to the lead screw, and a connecting member fixedly connecting the drive nut and the half drum.

[0020] Furthermore, each half drum further includes a reverse wrapping rod guide disk fixed to the other end of the outer shaft sleeve. The reverse wrapping unit includes a plurality of reverse wrapping rods distributed along the circumferential direction. Each reverse wrapping rod is provided with a first end and a second end. The first end is pivotally connected to the second locking mechanism, and the second end is freely placed on the reverse wrapping rod guide disk.

[0021] Furthermore, the reverse wrapping rod includes a first state parallel to the main shaft and a second state arranged at an angle to the main shaft. When the first locking mechanism locks the main shaft and the second locking mechanism releases the outer shaft sleeve, the second locking mechanism can axially move along the main shaft, and the reverse wrapping rod can be switched between the first state and the second state.

[0022] In the present invention, when the first locking mechanism locks the main shaft, the second locking mechanism can synchronously release the outer shaft sleeve. At this time, when the lead screw rotates, the second locking mechanism can axially move on the outer shaft sleeve. Thus, the first end of the reverse wrapping rod pivotally connected to the second locking mechanism can axially move along the main shaft, and the second end of the reverse wrapping rod can cooperate with the tire components on the tire building drum to perform the reverse wrapping action. When the first locking mechanism releases the main shaft, the second locking mechanism synchronously locks the outer shaft sleeve. There is no relative movement among the first locking mechanism, the second locking mechanism, and the outer shaft sleeve. Therefore, when the lead screw rotates, it can drive the second locking mechanism and the outer shaft sleeve to axially move, thereby driving the first locking mechanism to axially move, that is, the entire half drum axially moves. Furthermore, the distance between the two half drums can be adjusted to cooperate with the tire building drum to complete the shaping process of the tire components. Compared with the prior art, the tire building drum of the present invention has at least the following beneficial technical effects:

[0023] (1) In the tire building drum of the present invention, by providing the first cylinder block, the first piston, the first chamber, and the second chamber in the first locking mechanism, when the first piston is driven by air pressure to move in the first cylinder block, the first piston can compress the force transmission medium in the second chamber. After the force transmission medium is compressed, a huge pressure is generated instantaneously, and its pressure can reach up to hundreds of megapascals. This pressure can directly act on the pressing member, causing the pressing member to hold the main shaft tightly. Therefore, under the condition of the same pneumatic driving force, the pressure generated by the linkage structure of the present invention is greater than the simple air pressure, and thus the holding effect is better.

[0024] (2) In the tire building drum of the present invention, the spacing adjustment and the anti-packing assisting action of the two half-drums are coordinated by only one screw nut pair, and are completed by means of an alternating locking interlocking device composed of a first locking mechanism and a second locking mechanism, which greatly simplifies the mechanical structure and makes the control process simpler, so that the tire building drum can meet the requirements of lightweight, simplification and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a cross-sectional view of the first state of the first locking mechanism A of the tire building drum of Example 4 of the present invention (the first locking mechanism A is loosened and the second locking mechanism B' is tightened).

[0027] Figure 2 It is a cross-sectional view of the second state (the first locking mechanism A is tightened, and the second locking mechanism B' is loosened) of the first locking mechanism A of the tire building drum according to the fourth embodiment of the present invention.

[0028] Figure 3 It is a cross-sectional view of the first state of the first locking mechanism A of the tire building drum of Example 1 of the present invention (the first locking mechanism A is loosened and the second locking mechanism B is tightened).

[0029] Figure 4 It is a cross-sectional view of the second state (the first locking mechanism A is tightened, and the second locking mechanism B is loosened) of the first locking mechanism A of the tire building drum of Example 1 of the present invention.

[0030] Figure 5 It is a cross-sectional view of the first state (the first locking mechanism A is released and the second locking mechanism B is tightened) of the first locking mechanism A of the tire building drum of embodiment 2 of the present invention.

[0031] Figure 6 It is a cross-sectional view of the second state (the first locking mechanism A is tightened, and the second locking mechanism B is loosened) of the first locking mechanism A of the tire building drum of Example 2 of the present invention.

[0032] Figure 7 It is a cross-sectional view of the first state (the first locking mechanism A is released and the second locking mechanism B is tightened) of the first locking mechanism A of the tire building drum of Example 3 of the present invention.

[0033] Figure 8 yes Figure 1 A partial enlarged view of .

[0034] Figure 9 yesFigure 1 Partial enlarged view of

[0035] Figure 10 is Figure 5 Partial enlarged view of Detailed implementation mode

[0036] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying 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 accompanying drawings and through specific implementation modes.

[0038] As Figures 1 to 10 shown, the present invention discloses a tire building drum 100, which includes a main shaft 1, a middle ring (not shown) sleeved on the main shaft 1, and two half drums that are substantially symmetric with respect to the middle ring and arranged around the main shaft 1. Each half drum includes two outer shaft sleeves 3 sleeved on the main shaft 1 that are symmetric with respect to the middle ring. The two outer shaft sleeves 3 are respectively located on both sides of the middle ring and can move axially along the main shaft 1. It should be noted that Figures 1 to 5 only shows the half drum structure of the tire building drum 100.

[0039] The tire building drum 100 further includes a lead screw 4 located inside the main shaft 1 and coaxially arranged with the main shaft 1, and a connection assembly connecting the lead screw 4 and the half drums. The rotation of the lead screw 4 can sequentially drive the connection assembly and the two half drums to move axially relative to each other along the main shaft 1. The connection assembly includes two drive nuts 5 respectively located on both sides of the lead screw and threadedly connected to the lead screw 4, and a connecting member 6 fixedly connecting the drive nut 5 and the half drum. Wherein, on both sides of the tire building drum 100, the thread directions of the lead screw 4 are opposite and the pitches are equal. The two half drums are respectively fixedly connected to the corresponding drive nuts 5 through the connecting member 6. Therefore, the rotation of the lead screw 4 can drive the two drive nuts 5 to move axially relative to or away from each other, thereby driving the connecting member 6 and the two half drums to move axially relative to or away from each other. It should be particularly noted that key grooves (not numbered) are respectively provided on the main shaft 1 and the outer shaft sleeve 3 so that the connecting member 6 can extend into the main shaft 1 from the key groove to be connected to the drive nut 5.

[0040] As Figures 1 to 7As shown, each semi-drum further includes an interlocking device 7 disposed away from the middle ring, a reverse wrapping rod guide disk 8 disposed close to the middle ring, and a reverse wrapping unit having a plurality of reverse wrapping rods 9 distributed in the circumferential direction. The reverse wrapping rod 9 is provided with a first end 91 and a second end 92. The first end 91 is pivotally connected to the interlocking device 7, and the second end 92 is freely placed on the reverse wrapping rod guide disk 8. Further, the reverse wrapping rod 9 includes a first state substantially parallel to the main shaft 1 and a second state intersecting the main shaft 1 at a certain angle. When the second end 92 of the reverse wrapping rod 9 gradually moves away from the main shaft 1, the reverse wrapping rod 9 can be switched from the first state to the second state, so as to reverse wrap the components of the tire. When the second end 92 of the reverse wrapping rod 9 gradually approaches the main shaft 1, the reverse wrapping rod 9 can be switched from the second state to the first state, so as to reset the reverse wrapping rod 9 and prepare for the next reverse wrapping process.

[0041] As Figures 1 to 7 shown, the interlocking device 7 includes a first locking mechanism A sleeved on the main shaft 1 and axially connecting one end of the outer shaft sleeve 3, and a second locking mechanism B sleeved on the outer shaft sleeve 3 and located between the first locking mechanism A and the reverse wrapping rod guide disk 8. Among them, the first locking mechanism A can lock the main shaft 1, and the second locking mechanism B can lock the outer shaft sleeve 3. Further, the second locking mechanism B is fixedly connected to the transmission nut 5 through a connecting member 6, and one side thereof is pivotally connected to the first end 91 of the reverse wrapping rod 9. Therefore, the rotation of the lead screw 4 can sequentially drive the transmission nut 5, the connecting member 6, the second locking mechanism B, and the first end 91 of the reverse wrapping rod 9 to axially move on the outer shaft sleeve 3, so as to complete the reverse wrapping process of the tire components. When the first locking mechanism A locks the main shaft 1 and the second locking mechanism B loosens the outer shaft sleeve 3, the second locking mechanism B can axially move along the main shaft 1, and the reverse wrapping rod 9 can be switched between the first state and the second state.

[0042] As Figures 1 to 6 、 Figure 8 、and Figure 9 shown, the first locking mechanism A includes a first elastic member 10, a pressing member 11, and a first cylinder body sequentially arranged from the inside to the outside around the main shaft 1. The first cylinder body includes a first inner cylinder body 12 and a first outer cylinder body 13. A first cavity extending axially along the main shaft 1 is formed between the first inner cylinder body 12 and the first outer cylinder body 13. The first cavity is filled with a force-transmitting medium and the first cavity extends towards the pressing member. The first locking mechanism A further includes a first piston 15 received in the first cavity. The first piston 15 can axially move in the first cavity along the extending direction of the main shaft 1 to compress the force-transmitting medium to generate pressure, and the pressure acts on the pressing member to lock the main shaft.

[0043] As Figure 9As shown in the figure, the first piston 15 divides the first cavity into a first chamber 14, a third chamber 17, and a second chamber 16 that are successively farther away from the middle ring. Among them, the second chamber 16 is recessed from the inside of the first inner cylinder 12 to form, and a force - transmitting medium is filled therein. Further, the second chamber 16 includes a passage 161 extending toward the pressing member 11. In the present invention, the first chamber 14 and the third chamber 17 can be connected to a gas source or a fluid pressure source (such as a hydraulic pressure source). Taking the connection of the first chamber 14 and the third chamber 17 to the gas source as an example, the first piston 15 can be driven by gas to axially reciprocate along the extension direction of the main shaft 1. And an elastic member such as a spring can be provided on the inner side wall of the first chamber 14 facing the third chamber 17. At least one spring can be provided, which is axially parallel to the main shaft 1 and distributed around the first piston 15 to release the extrusion of the force - transmitting medium in the second chamber 16 by the first piston 15, so that the pressing member 11 returns to its original state to release the main shaft 1. Taking the liquid - plastic as an example for the force - transmitting medium in the second chamber 16, when the first piston 15 axially moves, it can extrude the liquid - plastic in the second chamber 16, so that the liquid - plastic can instantaneously generate a huge pressure, and its pressure can reach up to hundreds of megapascals.

[0044] As Figure 9 As shown in the figure, the first piston 15 is separately provided, which includes a first part 151 located in the first chamber 14 and the third chamber 17 and a second part 152 located in the second chamber 16 and the third chamber 17. The first part 151 is provided with a recess 19 for clamping one end of the second part 152, and the recess 19 can limit one end of the second part 152. Therefore, when the third chamber 17 is inflated through the gas source and the first air chamber 14 exhausts air at the same time, when the first part 151 is driven by the gas to move in the C direction, the second part 152 can be pushed by the first part 151 through the recess 19 to axially move in the second chamber 16 and the third chamber 17, so that the second part 152 can compress the force - transmitting medium in the second chamber 16, and the first piston 15 can move axially as a whole along the main shaft 1. On the contrary, when the first chamber 14 is inflated through the gas source and the third chamber 17 exhausts air from the gas source at the same time, the first part 151 is driven by the gas in the first chamber 14 to move in the opposite direction of C, then the force - transmitting medium in the second chamber 16 is no longer compressed, and the force - transmitting medium will elastically reset. When the force - transmitting medium resets, a reset pressure will be generated, and this reset pressure can successively push the second part 152 and the first part 151 to axially move for resetting. Of course, in other embodiments, the first part 151 and the second part 152 can also be reset not by inflating the first chamber 14, but only by the elastic reset force of the force - transmitting medium.

[0045] As Figure 8 and Figure 9As shown, the first elastic member 10 is a spring sleeve with a variable diameter. Its radially inner side is tightly sleeved on the main shaft 1, and its radially outer side is closely abutted against the pressing member 11. Thus, the compressive capacity of the end face of the pressing member 11 (referring to the axial pressure of the main shaft 1 in this embodiment) can be increased, and the pressing member 11 can be prevented from being damaged by the force. The pressing member 11 is a thin-walled ring located between the first elastic member 10 and the first inner cylinder 12, and its radially outer side closely adheres to the wall surface of the first inner cylinder 12. A radially recessed groove 20 is provided on the outer surface of the pressing member 11 to reduce the thickness of the pressing member 11, thereby increasing the deformation capacity of the pressing member 11. The groove 20 communicates with the passage 161 of the first inner cylinder 12. Since the passage 161 communicates with the second chamber 16, the groove 20, the passage 161, and the second chamber 16 communicate with each other. Also, since the second part 152 of the first piston 15 is received in the second chamber 16, a closed receiving cavity is formed by a part of the space of the second chamber 16, the passage 161, and the groove 20, and a certain volume of force-transmitting medium is filled in this receiving cavity. In addition, in order to ensure the sealing between the receiving cavity and the first chamber 14 and the third chamber 17 and prevent the force-transmitting medium in the receiving cavity from overflowing into the first chamber 14 and the third chamber 17, at least one sealing ring is provided between the second part 152 and the first inner cylinder 12, between the first part 151 and the first inner and outer cylinders, and between the pressing member 11 and the first inner cylinder 12.

[0046] As Figure 8 and Figure 9As shown, when the second part 152 of the first piston 15 is pushed by the first part 151 to move in the direction of C, the force - transmitting medium in the receiving cavity is compressed to generate a huge pressure. This pressure acts on the pressing member 11, and the pressing member 11 deforms under the force to squeeze the first elastic member 10. After being squeezed, the first elastic member 10 deforms, that is, its diameter becomes smaller. Thus, the first elastic member 10 can hold the main shaft 1 tightly, and further, the first locking mechanism A will not move axially relative to the main shaft 1. In addition, since the pressure generated by the compression of the force - transmitting medium in the second chamber 16 is absorbed by the first elastic member 10 and the pressing member 11 to cause the first elastic member 10 and the pressing member 11 to deform, in order to make the pressure generated by the compression of the force - transmitting medium be used for holding the main shaft 1 in the largest proportion and make the holding effect better, in other feasible cases, the first elastic member 10 can also be not provided, and only the pressing member 11 is used to hold the main shaft 1 tightly. When the air source no longer supplies air to the first chamber 14, the pressure generated by the force - transmitting medium disappears, and the first elastic member 10 and the pressing member 11 return to their original states by their own elastic forces, thus loosening the main shaft 1. The force - transmitting medium in the second chamber 16 is affected by the elastic restoring forces of the first elastic member 10 and the pressing member 11, and can push the second part 152 to move axially in the opposite direction of C to push the first part 151 to also move axially in the opposite direction of C. At the same time, the first part 151 can also be pushed axially in the opposite direction of C by the air pressure in the third cavity 17. Thus, the first piston 15 can move axially in the opposite direction of C to reset.

[0047] The first part 151 and the second part 152 of the first piston 15 of the present invention can also be integrally provided. As Figure 9 and combined with Figure 5 、 Figure 6 shown, the first part 151 and the second part 152 are integrated into one body, and this integrated body reciprocates in the first chamber 14, the third chamber 17 and the second chamber 16.

[0048] The present invention also provides an alternative embodiment. As Figure 7 、 Figure 10 shown, the aforementioned first locking mechanism A' includes a first elastic member 10, a pressing member 11 and a first cylinder body which are arranged in sequence from the inside to the outside around the main shaft 1. The first cylinder body includes a first inner cylinder body 12 and a first outer cylinder body 13. A first cavity extending radially along the main shaft 1 is formed between the first inner cylinder body 12 and the first outer cylinder body 13. A first piston 15' is received in the first cavity, and the first piston 15' can be driven by gas to move radially along the main shaft 1 in the first cavity. The first piston 15' divides the first cavity into a first chamber (not shown) far from the main shaft 1 and a second chamber 16' close to the main shaft 1, and the force - transmitting medium is located in the second chamber 16', and the second chamber 16' extends towards the pressing member 11.

[0049] Further, the first elastic member 10 is a spring sleeve with a variable diameter. Its radially inner side is tightly sleeved on the main shaft 1, and its radially outer side is closely abutted against the pressing member 11. Thus, the compressive capacity of the end face of the pressing member 11 (the axial pressure of the main shaft 1 in this embodiment) can be increased, and the pressing member 11 can be prevented from being damaged by force. The pressing member 11 is a thin-walled ring located between the first elastic member 10 and the first inner cylinder 12, and its radially outer side closely adheres to the wall surface of the first inner cylinder 12. A groove 20 is concavely provided on the radially outer side of the pressing member 11 to reduce the thickness of the pressing member 11, thereby increasing the deformation capacity of the pressing member 11. The groove 20 communicates with the second chamber 16', and the second chamber 16' and the groove 20 form a closed receiving chamber, and a certain volume of force transmission medium is filled in the receiving chamber. In order to ensure the sealing between the receiving chamber and the first chamber and prevent the force transmission medium in the receiving chamber from overflowing into the first chamber, at least one sealing ring is provided between the first piston 15' and the first inner cylinder 12 and the first outer cylinder 13, and between the pressing member 11 and the first inner cylinder 12.

[0050] As Figure 7 , Figure 10 shown, when the first piston 15' moves towards the D direction, the force transmission medium in the second chamber 16' and the groove 20 is compressed to generate a huge pressure. This pressure acts on the pressing member 11 and the first elastic member 10 in sequence. After the pressing member 11 is stressed, it deforms to squeeze the first elastic member 10. After the first elastic member 10 is squeezed, it deforms, that is, its diameter becomes smaller. Thus, the first elastic member 10 can hold the main shaft 1 tightly, and further, the first locking mechanism A will not axially move relative to the main shaft 1. Preferably, in order to make the holding effect better, the first elastic member 10 can also be not provided, and only rely on the pressing member 11 to hold the main shaft 1 tightly.

[0051] As Figures 1 to 8As shown in the figure, the second locking mechanism B includes a second elastic member 30 and a second cylinder 31 that are arranged around the outer shaft sleeve 3 from the inside to the outside in sequence. The second cylinder 31 clamps both ends of the second elastic member 30, so that the second elastic member 30 will not move axially relative to the second cylinder 31. A second cavity 32 is formed between the second elastic member 30 and the second cylinder 31. A second piston 33 is arranged in the second cavity 32, and the second piston 33 can be driven by gas to move axially along the main shaft 1. Further, the second elastic member 30 is composed of two conical members arranged around the outer shaft sleeve 3. The conical members are semi-annular bodies, and the two semi-annular bodies cooperate with each other to hold the outer shaft sleeve 3 tightly. There is a gap at the joint of the two semi-annular bodies, and the outer side wall of the two semi-annular bodies is in tapered fit with the inner side wall of the second piston 33. Since the second elastic member 30 will not move axially relative to the second cylinder 31, when the second piston 33 moves axially towards the middle ring, the tapered surface of the second piston 33 presses the tapered surfaces of the two semi-annular bodies of the second elastic member 30, and the two semi-annular bodies move radially away from the second cylinder 31, so that the diameter of the second elastic member 30 gradually becomes smaller until it holds the outer shaft sleeve 3 tightly. Furthermore, the second locking mechanism B can lock the outer shaft sleeve 3. Since the holding effect of the first locking mechanism A is better than that of the second locking mechanism B, in order to achieve a better tire forming effect of the tire forming drum, the second locking mechanism B can also adopt the same structure as the first locking mechanism A. Specifically, see Figure 1 and Figure 2 the second locking mechanism B' in

[0052] One end of the outer shaft sleeve 3 of the tire forming drum 100 of the present invention is fixedly connected to the first outer cylinder 13, and the other end is fixedly connected to the reverse wrapping rod guide disc 8. The first locking mechanism A or A' or the second locking mechanism B or B' is fixedly connected to the connecting member 6. In this embodiment, the first locking mechanism A or A', and the second locking mechanism B or B' can be supplied with gas from the same gas source, and the release control of the first locking mechanism A or A' and the locking control of the second locking mechanism B or B' are realized by the same gas source or hydraulic source. The locking control of the first locking mechanism A or A' and the release control of the second locking mechanism B or B' are realized by the same gas source or hydraulic source. Specifically, taking the interlocking of the first locking mechanism A and the second locking mechanism B' as an example, the first locking mechanism A and the second locking mechanism B' have the same structure. Then, the second locking mechanism B' has a fourth chamber 14', a fifth chamber 16-1, and a sixth chamber 17' that respectively correspond to the first chamber 14, the second chamber 16, and the third chamber 17 of the first locking mechanism A, and also has a third piston 15-1 that corresponds to the first piston 15 of the first locking mechanism A.

[0053] Such as Figure 9As shown, the sixth chamber 17' and the first chamber 14 are supplied with gas by the same gas source, and the third chamber 17 and the fourth chamber 14' are supplied with gas by the same gas source. When the sixth chamber 17' and the first chamber 14 are supplied with gas, the third chamber 17 and the fourth chamber 14' exhaust gas. Then, the third piston 15-1 moves in the C direction to squeeze the fifth chamber 16-1 so that the second locking mechanism B' clamps the outer shaft sleeve 3, and the first piston 15 moves in the opposite direction of C to elastically recover the force-transmitting medium in the second chamber 16, so that the first locking mechanism A releases the main shaft 1. Conversely, when the sixth chamber 17' and the first chamber 14 exhaust gas, the third chamber 17 and the fourth chamber 14' are supplied with gas, then the third piston 15-1 moves in the opposite direction of C to elastically recover the force-transmitting medium in the fifth chamber 16-1, so that the second locking mechanism B' releases the outer shaft sleeve 3, and the first piston 15 moves in the C direction to squeeze the force-transmitting medium in the second chamber 16 so that the first locking mechanism A clamps the main shaft 1.

[0054] Therefore, when the first locking mechanism A or A' locks the main shaft 1, the second locking mechanism B or B' can synchronously release the outer shaft sleeve 3. At this time, when the lead screw 4 rotates, the second locking mechanism B or B' can axially move on the outer shaft sleeve 3. Thus, the first end 91 of the reverse wrapping rod 9 pivotally connected to the second locking mechanism B or B' can axially move along the main shaft 1, and the second end 92 of the reverse wrapping rod 9 can cooperate with the tire components on the tire building drum 100 to perform the reverse wrapping action; when the first locking mechanism A or A' releases the main shaft 1, the second locking mechanism B or B' synchronously locks the outer shaft sleeve 3, and there is no relative movement among the first locking mechanism A or A', the second locking mechanism B or B', and the outer shaft sleeve 3. Therefore, when the lead screw 4 rotates, it can drive the second locking mechanism B or B' and the outer shaft sleeve 3 to axially move, thereby driving the first locking mechanism A or A' to axially move, that is, the entire half-drum axially moves, and further the distance between the two half-drums can be adjusted to cooperate with the tire building drum 100 to complete the shaping process of the tire components.

[0055] The beneficial effects of the present invention are:

[0056] (1) In the tire building drum, the first locking mechanism is provided with a first cylinder block, a first piston, a first chamber and a second chamber. When the first piston is driven by air pressure to move in the first cylinder block, the first piston can compress the force-transmitting medium in the second chamber. After the force-transmitting medium is compressed, a huge pressure is generated instantaneously, and its pressure can reach hundreds of megapascals. This pressure directly acts on the pressing member, making the pressing member clamp the main shaft. Therefore, under the condition of the same pneumatic driving force, the pressure generated by the linkage structure of the present invention is greater than the simple air pressure, so the clamping effect is better.

[0057] (2) In the tire building drum, the adjustment of the distance between the two half drums and the reverse wrapping assisting action are only completed by the cooperation of a lead screw nut pair, and at the same time, with the assistance of the interlocking device with alternating locking formed by the first locking mechanism and the second locking mechanism, which greatly simplifies the mechanical structure and makes the control process simpler, so that the tire building drum can meet the requirements of light weight, simplicity and miniaturization.

[0058] In the description of the specific embodiments, the descriptive terms such as "in this embodiment", "in one embodiment", "in the 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.

[0059] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A tire building drum, comprising: A main shaft, a lead screw located in the main shaft, two half drums arranged around the main shaft, and a connecting assembly connecting the two half drums to the lead screw respectively, characterized in that: Each of the half drums comprises an outer sleeve sleeved on the main shaft, an interlocking device and a turn-up unit pivotally connected to the interlocking device at one end, the interlocking device comprises a first locking mechanism sleeved on the main shaft and fixed to one end of the outer sleeve and a second locking mechanism sleeved on the outer sleeve, when the first locking mechanism locks the main shaft, the second locking mechanism releases the outer sleeve; when the first locking mechanism releases the main shaft, the second locking mechanism locks the outer sleeve, and the connecting assembly is fixedly connected to the second locking mechanism; The first locking mechanism comprises a pressure piece and a first cylinder which are sequentially arranged around the main shaft from the inside to the outside, the first cylinder being provided with a first cavity, the first cavity containing a force transmission medium and extending toward the pressure piece, the first locking mechanism further comprising a first piston received in the first cavity, the first piston being movable in the first cavity to compress the force transmission medium to generate pressure, the pressure acting on the pressure piece to lock the main shaft; The first piston divides the first cavity into a first chamber and a second chamber, the second chamber extends toward the pressure member and the force transmission medium is located in the second chamber, and the first piston can move radially in the first chamber to compress the force transmission medium in the second chamber; The first locking mechanism further includes a first elastic member located between the main shaft and the pressing member. The pressure causes the pressing member to press against the first elastic member, and the first elastic member deforms to hold the main shaft tightly.

2. The tire building drum according to claim 1, characterized in that, The force transmission medium is liquid plastic.

3. The tire building drum according to claim 1, wherein The second locking mechanism has the same structure as the first locking mechanism.

4. The tire building drum according to claim 1, wherein The first cylinder body includes a first inner cylinder body and a first outer cylinder body, and the first inner cylinder body cooperates with the first outer cylinder body to form a first cavity.

5. The tire building drum according to claim 1, wherein The pressing member is provided with a radially recessed groove, and the first cavity is communicated with the groove.

6. The tire building drum according to claim 1, wherein, The first piston includes a first part and a second part, the first part and the second part divide the first cavity into a first chamber, a second chamber and a third chamber, the second chamber extends toward the pressure member, the second part and the force transmission medium are both located in the second chamber, and the first part is located in the first chamber and the third chamber.

7. The tire building drum according to claim 6, wherein, The first part is provided with a recessed portion which is clamped with one end of the second part, and the recessed portion can limit one end of the second part. The first part pushes the second part to move axially along the main axis through the recessed portion to compress the force transmission medium in the second chamber.

8. The tire building drum according to claim 1, wherein, The second locking mechanism comprises a second elastic member and a second cylinder body which are arranged around the outer sleeve and in sequence from the inside to the outside, and the second cylinder body is clamped at two ends of the second elastic member.

9. The tire building drum according to claim 8, wherein, A second cavity is formed between the second elastic member and the second cylinder body. A second piston is accommodated in the second cavity. The second piston can be driven by gas or liquid to move axially along the main shaft.

10. The tire building drum according to claim 9, characterized in that, The second elastic member is composed of two conical members arranged around the outer shaft sleeve. The conical member is a semi-annular body. There is a gap between the two semi-annular bodies. The semi-annular body is in conical surface fit with the second piston.

11. The tire building drum according to any one of claims 1 to 10, characterized in that, The release control of the first locking mechanism and the locking control of the second locking mechanism are realized by the same air source or hydraulic source. The locking control of the first locking mechanism and the release control of the second locking mechanism are realized by the same air source or hydraulic source.

12. The tire building drum according to claim 1, characterized in that, The connecting assembly includes two drive nuts respectively located on both sides of the lead screw and threadedly connected to the lead screw, and a connecting member fixedly connecting the drive nut and the semi-drum.

13. The tire building drum according to any one of claims 1-10 or claim 12, characterized in that, Each semi-drum further includes a reverse wrapping rod guide disc fixed to the other end of the outer shaft sleeve. The reverse wrapping unit includes a plurality of reverse wrapping rods distributed along the circumferential direction. Each reverse wrapping rod is provided with a first end and a second end. The first end is pivotally connected to the second locking mechanism, and the second end is freely placed on the reverse wrapping rod guide disc.

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