Tire building drum and tire building machine having the same

Abstract

The application provides a tire forming drum and a tire forming machine with the same, and the tire forming drum comprises a main shaft and two half-drum devices sleeved on the main shaft; the half-drum device comprises an outer shaft sleeved on the main shaft, an interlocking mechanism comprising a first locking mechanism and a second locking mechanism which are alternately locked, the first locking mechanism is sleeved on the main shaft and fixedly connected with the outer shaft, and the second locking mechanism is sleeved on the outer shaft; a turn-up capsule; and a turn-up assisting mechanism comprising a plurality of assisting plates and a plurality of assisting connecting rods which are uniformly distributed along the circumference; when the first locking mechanism locks the main shaft and the second locking mechanism releases the outer shaft, the second locking mechanism can move along the outer shaft in the axial direction to push the assisting plates to overturn to the radial outside of the half-drum device, and an assisting force is provided for the turn-up capsule. The forming drum has the advantages of uniform turn-up height, good turn-up circumferential continuity, uniform stress, high production efficiency and the like, and can meet the requirements of light weight, simplification and miniaturization.

Description

Technical Field

[0001] The present invention relates to the technical field of tire building equipment, in particular to a tire building drum used in a tire building machine. Background Art

[0002] The tire building drum is the actuator of tire building and directly affects the quality of tire building.

[0003] At present, the existing mechanical turn-up forming drum realizes the turn-up action by driving a number of turn-up rod assemblies evenly distributed in the circumferential direction. Although it has the advantages of consistent turn-up height and high production efficiency, it still has problems such as discontinuity on the turn-up circumference and deep indentation.

[0004] Although the existing capsule reverse packaging forming drum has the advantages of good reverse packaging circumference continuity and uniform force, each reverse packaging capsule needs to be associated with a corresponding boosting mechanism.

[0005] When the boosting mechanism is specifically a boosting capsule, the disadvantages are: the capsule device has a slow inflation speed, which greatly affects production efficiency, and the reverse packaging quality is unstable. In addition, the capsule is easily damaged, has a short service life, and needs to be replaced frequently.

[0006] When the boosting mechanism is specifically a number of boosting plates distributed in a circle, although it has the advantages of consistent turn-up height and high production efficiency, as well as good turn-up circumferential continuity and uniform force, an additional driving mechanism is required to push the boosting plates to flip, and the structure is complex and takes up space, which makes it difficult to meet the requirements of lightweight, simplified and miniaturized tire forming drums. Summary of the Invention

[0007] The purpose of the present invention is to solve the above problems and provide a bladder building drum, which has the advantages of consistent turn-up height, good turn-up circumferential continuity, uniform force and high production efficiency, and can meet the requirements of lightweight, simple and miniaturized tire building drum.

[0008] To achieve the above object, the present invention provides a tire building drum, comprising: a main shaft and two half-drum devices symmetrically mounted on the main shaft; each half-drum device comprises:

[0009] The outer shaft is sleeved outside the main shaft;

[0010] An interlocking mechanism comprising a first locking mechanism and a second locking mechanism that are alternately locked, wherein the first locking mechanism is sleeved on the main shaft and can lock or release the main shaft, and the second locking mechanism is sleeved on the outer shaft and can lock or release the outer shaft, and the first locking mechanism is also fixedly connected to the outer shaft;

[0011] An inverted capsule capable of switching between a vacuum state and an inflated state; and

[0012] The turn-up boosting mechanism comprises a plurality of boosting plates and a plurality of boosting links distributed along the circumference, one end of the boosting link is pivotally connected with the boosting plate, and the other end of the boosting link is pivotally connected with the second locking mechanism;

[0013] When the first locking mechanism locks the main shaft and the second locking mechanism releases the outer shaft, the second locking mechanism can drive the boosting link to make the boosting plate turn over to the radial outside of the half-drum device, thereby providing boosting force for the turn-up capsule in the inflated state.

[0014] Further, the tire forming drum further comprises a transmission assembly for driving the two half-drum devices, the transmission assembly comprises a ball screw and two sets of connecting assemblies mounted on the ball screw and in transmission cooperation with the ball screw, and the two sets of connecting assemblies are further connected with the second locking mechanisms in the corresponding half-drum devices respectively.

[0015] Further, the ball screw is provided with threads of equal pitch but opposite directions symmetrically on the left and right sides; the connecting assembly comprises a transmission nut and a connecting part, the transmission nut is threadedly connected with the ball screw, one end of the connecting part is connected with the transmission nut, and the other end of the connecting part is connected with the second locking mechanism in the corresponding half-drum device.

[0016] Further, the main shaft is in a hollow structure, the ball screw is coaxially arranged in the interior of the main shaft, and the main shaft and the outer shaft are respectively provided with a sliding groove and a sliding groove arranged in the axial direction, and the connecting part passes through the sliding grooves and the sliding groove in sequence and is connected with the second locking mechanism.

[0017] Further, the first locking mechanism comprises a first pressing piece and a first cylinder body arranged in the main shaft from inside to outside in sequence, the first pressing piece is sealingly connected with the first cylinder body, a first cavity is formed in the first cylinder body and extends towards the first pressing piece, the first cavity is filled with a force transmission medium, the first locking mechanism further comprises a first piston assembly accommodated in the first cavity, the first piston assembly is movable in the first cavity to extrude the force transmission medium to generate pressure, the pressure acts on the first pressing piece to make the first pressing piece deform to lock the main shaft.

[0018] Further, the first piston assembly divides the first cavity into a first chamber, a second chamber and a third chamber arranged in sequence, the third chamber extends towards the first pressing piece, the force transmission medium is filled in the third chamber, the first chamber is connected with a gas source or a hydraulic source, and the first piston assembly is movable in the first cylinder body under the action of the gas or the hydraulic pressure to extrude the force transmission medium in the third chamber to generate pressure, the pressure acts on the first pressing piece to make the first pressing piece deform to lock the main shaft.

[0019] Furthermore, the first pressure member is a sleeve, both ends of which are tightly attached to the wall of the first cylinder body, and a groove is formed in the middle thereof, which is connected to the third chamber. The groove is also filled with a force transmission medium, and the groove is composed of one or more annular grooves or a plurality of grooves evenly distributed along the circumferential direction.

[0020] Furthermore, the first cylinder includes a first inner cylinder and a first outer cylinder, the first inner cylinder and the first outer cylinder cooperate to form a first cavity, and the third cavity includes a partial section formed in the first inner cylinder and extending toward the first pressure member.

[0021] Furthermore, the second locking mechanism can adopt the same mechanism as the first locking mechanism. Specifically, the second locking mechanism includes a second pressure piece and a second cylinder body arranged in sequence from the inside to the outside around the outer shaft. The second pressure piece is sealed with the second cylinder body. A second cavity is formed in the second cylinder body, and the second cavity extends toward the second pressure piece. The second cavity is filled with a force transmission medium. The second locking mechanism also includes a second piston assembly accommodated in the second cavity. The second piston assembly can move in the second cavity to squeeze the force transmission medium to generate pressure. The pressure acts on the second pressure piece to deform it to lock the outer shaft.

[0022] Furthermore, the second piston assembly divides the second cavity into a fourth chamber, a fifth chamber and a sixth chamber, which are arranged in sequence. The sixth chamber extends toward the second elastic member, and the force transmission medium is filled in the sixth chamber; the fourth chamber is connected to the air source or the hydraulic source, and the second piston assembly can move in the second cylinder under pneumatic or hydraulic action to squeeze the force transmission medium in the sixth chamber to generate pressure, and the pressure acts on the second pressure member to deform it to lock the outer shaft.

[0023] Furthermore, the second pressure member is a sleeve, both ends of which are tightly attached to the wall of the second cylinder body, and a groove is formed in the middle thereof, which is connected to the sixth chamber. The groove is also filled with a force transmission medium, and the groove is composed of one or more annular grooves or a plurality of grooves evenly distributed along the circumferential direction.

[0024] Furthermore, the second cylinder includes a second inner cylinder and a second outer cylinder, the second inner cylinder and the second outer cylinder cooperate to form a second cavity, and the sixth chamber includes a partial section formed in the second inner cylinder and extending toward the second pressure member.

[0025] Furthermore, the second locking mechanism can also adopt another mechanism different from the first locking mechanism. Specifically, the second locking mechanism includes a second elastic member and a second cylinder body arranged in sequence from the inside to the outside around the outer shaft, the second cylinder body is clamped at both ends of the second elastic member, and a second cavity is formed in the second cylinder body; the second locking mechanism also includes a second piston assembly accommodated in the second cavity, and a conical surface is formed between the second piston assembly and the radial outer side of the second elastic member. The second piston assembly divides the second cavity into a fourth chamber and a fifth chamber. The second piston assembly can move axially along the outer shaft under pneumatic or hydraulic action to squeeze the second elastic member. The squeezed second elastic member can shrink radially to lock the outer shaft.

[0026] Furthermore, the connecting assembly is connected to the second cylinder of the corresponding second locking mechanism; one end of the boost connecting rod is pivotally connected to the boost plate, and the other end is pivotally connected to the second cylinder of the second locking mechanism.

[0027] Furthermore, the force transmission medium is liquid plastic.

[0028] Furthermore, the release control of the first locking mechanism and the locking control of the second locking mechanism are achieved by the same air source or hydraulic source, and the locking control of the first locking mechanism and the release control of the second locking mechanism are achieved by the same air source or hydraulic source.

[0029] The present invention also provides a tire building machine, wherein the tire building machine is equipped with the tire building drum described in the present invention.

[0030] Compared with the prior art, the tire building drum of the present invention has at least the following beneficial technical effects:

[0031] (1) A back-up boosting mechanism consisting of a boosting plate and a boosting connecting rod is used to replace the boosting capsule to provide a boosting force for the back-up capsule, so that the tire building drum has the advantages of consistent back-up height and high production efficiency, as well as good back-up circumferential continuity and uniform force.

[0032] (2) In the tire building drum of the present invention, the spacing adjustment and the anti-packing assisting action of the two half-drum devices are completed by only one ball screw transmission pair in cooperation with an alternating locking interlocking mechanism composed of a first locking mechanism and a second locking mechanism, which greatly simplifies the mechanical structure of the building drum and makes the building drum control process simpler, so that the tire building drum can meet the requirements of lightweight, simplification and miniaturization.

[0033] (3) In the interlocking mechanism of the tire building drum of the present invention, the first and second locking mechanisms are a linkage structure. First, under the action of pneumatic or hydraulic pressure, the first and second piston assemblies are moved in the first and second cylinder bodies. Then, the first and second piston assemblies squeeze the force transmission medium sealed in the chamber (such as the third and sixth chambers) to generate a large pressure. This pressure acts on the first and second pressure members to deform them to position and lock the main shaft and the outer shaft. This linkage structure can achieve a better locking effect under the same pneumatic or hydraulic driving force conditions.

[0034] Preferably, the force transmission medium is liquid plastic. By utilizing the incompressibility of liquid plastic, the pressure can be evenly transmitted to the pressure piece (i.e., thin-walled sleeve), and the main shaft or outer shaft can be positioned and clamped through the deformation of the pressure piece, so that it has the characteristics of uniform and reliable clamping; and the above-mentioned pressure can be as high as tens or even hundreds of MPa, that is, a larger force multiplication ratio is obtained under the same pneumatic or hydraulic driving force conditions, which can achieve a better locking effect; in addition, liquid plastic also has the characteristics of stable performance and not easy to leak, and can be used for a long time without maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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:

[0036] Figure 1 Schematic diagram of the cross-sectional structure of the tire building drum provided in Example 1 of the present invention Figure 1 (the first locking mechanism is released and the second locking mechanism is locked);

[0037] Figure 2 for Figure 1 Enlarged view of the M in the middle;

[0038] Figure 3 Schematic diagram of the cross-sectional structure of the tire building drum provided in Example 1 of the present invention Figure 2 (the first locking mechanism is locked and the second locking mechanism is released);

[0039] Figure 4 for Figure 3 Enlarged view of point N in the middle;

[0040] Figure 5 Schematic diagram of the cross-sectional structure of the tire building drum provided in the second embodiment of the present invention Figure 1 (the first locking mechanism is released and the second locking mechanism is locked);

[0041] Figure 6 for Figure 5 Enlarged view of M' in the middle;

[0042] Figure 7Schematic diagram of the cross-sectional structure of the tire building drum provided in the second embodiment of the present invention Figure 2 (the first locking mechanism is locked and the second locking mechanism is released);

[0043] Figure 8 for Figure 7 Enlarged view of N' in the middle. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] like Figure 1-8 As shown, the present invention provides a tire building drum 100, which is used in a tire building machine to build unvulcanized tire blanks. Specifically, the tire building drum 100 comprises a main shaft 1, a center ring 2 mounted on the main shaft 1, and two half-drum devices 3 arranged substantially symmetrically about the center of the center ring 2 and surrounding the main shaft 1. The main shaft 1 is a hollow structure. When building a spare tire blank with a smaller mold width, especially a non-full-size spare tire blank, the center ring 2 can be eliminated, providing a larger range of travel for the two half-drum devices 3 to move toward each other, thereby meeting the needs of building tire blanks with smaller mold widths.

[0046] Each half-drum device 3 comprises:

[0047] The outer shaft 31 is sleeved outside the main shaft 1;

[0048] The interlocking mechanism 32, 32' includes a first locking mechanism 321 and a second locking mechanism 322, 322' that alternately locks. The first locking mechanism 321 is sleeved on the main shaft 1 and can lock or release the main shaft 1. The second locking mechanism 322, 322' is sleeved on the outer shaft 31 and can lock or release the outer shaft 31. The first locking mechanism 321 is also fixedly connected to the outer shaft 31.

[0049] A bead positioning assembly 33, which is fixedly connected to the outer shaft 31, is used to radially support the bead 5 and also provide lateral support for the end surface of the bead 5 to prevent the bead 5 from axial movement;

[0050] The reverse capsule 34 can be switched between a vacuum state and an inflated state; and

[0051] The reverse boosting mechanism 35 includes a plurality of boosting plates 351 and a plurality of boosting connecting rods 352 evenly distributed along the circumference. One end of the boosting connecting rod 352 is pivotally connected to the boosting plate 351 , and the other end of the boosting connecting rod 352 is pivotally connected to the second locking mechanism 322 , 322 ′.

[0052] Preferably, if Figure 1 and Figure 5 As shown above, the tire bead positioning assembly 33 includes a fixing seat 331 fixedly connected to the outer shaft 31 , the turn-up capsule 34 is mounted on the fixing seat, and one end of the booster plate 351 can be pivotally connected to the fixing seat 331 .

[0053] like Figure 1 and Figure 5 As shown, the tire building drum 100 also includes a transmission assembly 4 for driving the half-drum assembly 3. Specifically, the transmission assembly 4 includes a ball screw 41 and two connecting assemblies 40 mounted on the ball screw 41 and drivingly engaged with the ball screw 41. The ball screw 41 and the connecting assemblies 40 form a ball screw transmission pair. The two connecting assemblies 40 are also respectively connected to the second locking mechanism 322, 322' of the corresponding half-drum assembly 3. Preferably, the connecting assembly 40 consists of a drive nut 42 and a connecting component 43 to facilitate assembly. One end of the connecting component 43 is connected to the drive nut 42, and the other end is connected to the second locking mechanism 322, 322' of the corresponding half-drum assembly 3.

[0054] The ball screw 41 is symmetrically provided with threads with equal pitches but opposite directions, so that the two half-drum devices 3 or some components of the two half-drum devices 3 can move synchronously.

[0055] Furthermore, the ball screw 41 is coaxially disposed within the main shaft 1. Axially disposed slots x and y are respectively defined on the main shaft 1 and the outer shaft 31 of the half-drum assembly 3. A connecting member 43 passes through slots x and y, respectively, and connects to the second locking mechanisms 322 and 322'. As a result, when the ball screw 41 rotates, the drive nut 42, which moves axially along the ball screw 41, drives the connecting member 43 to move axially along the two slots, thereby driving the half-drum assembly 3 or a portion thereof to move axially.

[0056] In addition, the transmission assembly 4 further includes a bearing device 44 provided between the main shaft 1 and both ends of the ball screw 41 to ensure the stability and reliability of the transmission of the ball screw 41 .

[0057] In the present invention, when the interlocking mechanisms 32, 32' are actually controlled, the release control of the first locking mechanism 321 and the locking control of the second locking mechanisms 322, 322' are achieved by the same air source or hydraulic source. The locking control of the first locking mechanism 321 and the release control of the second locking mechanisms 322, 322' are also achieved by the same air source or hydraulic source. This allows one locking mechanism to be locked and the other to be released at the same time, thereby forming an interlocking method of alternating locking of the interlocking mechanisms 32, 32'. In addition, to ensure the synchronization of the operation of the two half-drum devices 3 in the tire building drum 100, the interlocking mechanisms 32, 32' in the two half-drum devices 3 operate synchronously.

[0058] like Figure 1-2 as well as Figure 5-6 As shown, several circumferentially distributed booster plates 351 in the reverse-wrapping booster mechanism 35 are folded into a circular ring shape to support the reverse-wrapping capsule 34 in a vacuum state, so that the outer circumferential surface of the half-drum device 3 is in a nearly true circular state, thereby facilitating wrapping of the tire carcass material 6. At the same time, the first locking mechanism 321 releases the hollow main shaft 1 and the second locking mechanisms 322, 322' lock the outer shaft 31, allowing the entire half-drum device 3 to move along the hollow main shaft 1. Under the drive of the corresponding drive device (not shown) in the tire building machine, the ball screw 41 in the transmission assembly 4 rotates forward to drive the drive nut 42 and the connecting component 43 to move axially, thereby driving the entire half-drum device 3 to move along the hollow main shaft 1. The drum spacing between the two half-drum devices 3 is adjusted according to the flat width and shaping width requirements of the tire blank, thereby preparing for actions such as material application, bead installation, and inflation and shaping.

[0059] like Figure 3-4 as well as Figure 7-8 As shown, after the two half-drum devices 3 move toward each other to a predetermined position, the first locking mechanism 321 locks the hollow main shaft 1 and the second locking mechanism 322, 322' releases the outer shaft 31. Under the driving action of the corresponding driving device (not shown) in the tire building machine, the ball screw 41 in the transmission assembly 4 continues to rotate forward. At this time, the outer shaft 31 no longer moves with the second locking mechanism 322, 322'. The second locking mechanism 322, 322' can move axially along the outer shaft 31 to drive the booster link 352 so that the booster plate 351 flips toward the radial outside of the half-drum device 3. Preferably, as shown in FIG. Figure 4 as well as Figure 8 As shown, the boosting plate 351 flips around the fixing seat 331 in the tire bead positioning assembly 33 toward the radial outside of the half-drum device 3, providing a boosting force for the inflated turn-up capsule 34 to achieve turn-up.

[0060] It can be seen that in the tire building drum 100 of the present invention, the spacing adjustment and the anti-packing assisting action of the two half-drum devices 3 can be completed by a ball screw transmission pair in conjunction with the alternating locking interlocking mechanism 32, 32' composed of the first locking mechanism 321 and the second locking mechanism 322, 322', which greatly simplifies the mechanical structure of the tire building drum and also makes the driving control process of the building drum simpler.

[0061] Next, we will combine the Figure 1-4 The interlocking mechanism 32 in the tire building drum 100 provided by the first embodiment of the present invention is described in detail.

[0062] like Figure 2 and Figure 4 As shown, the first locking mechanism 321 is a linkage structure. Specifically, the first locking mechanism 321 includes a first pressure piece 3216 and a first cylinder body 3210 arranged in sequence from the inside to the outside around the main shaft 1. The first pressure piece 3216 is sealed with the first cylinder body 3210. A first cavity is formed in the first cylinder body 3210, and the first cavity extends toward the first pressure piece 3216. The first cavity is filled with a force transmission medium. The first locking mechanism 321 also includes a first piston assembly 3215 accommodated in the above-mentioned first cavity. The first piston assembly 3215 can move in the first cavity to squeeze the above-mentioned force transmission medium.

[0063] Preferably, the first piston assembly 3215 divides the first cavity into a first chamber A, a second chamber B, and a third chamber C, with the third chamber C extending toward the first pressure member 3216. The force transmission medium is filled in the third chamber C. The first chamber A can be connected to an air or hydraulic source. Thus, under pneumatic or hydraulic pressure, the first piston assembly 3215 can compress the force transmission medium in the third chamber C, generating a high pressure. This pressure acts on the first pressure member 3216, causing it to deform and thereby lock the hollow main shaft 1. The second chamber B can also be connected to an air or hydraulic source. Alternatively, a plurality of elastic members, such as springs, can be disposed within the second chamber B along the axial direction of the first piston assembly 3215. Driven by pneumatic or hydraulic pressure, or a spring return force, the first piston assembly 3215 can move toward the first chamber A, releasing the force transmission medium in the third chamber C, thereby returning the first pressure member 3216 to its original position and releasing the hollow main shaft 1.

[0064] Preferably, the first pressure member 3216 is a thin-walled sleeve, with both ends closely contacting the wall of the first cylinder 3210. A groove D is formed in its center, communicating with the third chamber C. The groove D may be composed of one or more annular grooves or a plurality of grooves uniformly distributed in an array along the circumference. The groove D is also filled with the aforementioned force transmission medium.

[0065] Preferably, the force transmission medium is liquid plastic. By utilizing the incompressibility of liquid plastic, the pressure can be evenly transmitted to the first pressure member 3216, so that the locking mechanism has the characteristics of uniform and reliable clamping; and the above-mentioned pressure can be as high as tens or even hundreds of MPa, that is, under the same pneumatic or hydraulic driving force conditions, a larger force amplification ratio can be obtained, thereby achieving a better locking effect; in addition, liquid plastic also has the characteristics of stable performance and not easy to leak, and can be used for a long time without maintenance.

[0066] Preferably, a plurality of first cavities are evenly formed in the first cylinder 3210 , and the plurality of first piston assemblies 3215 are respectively accommodated in the plurality of first cavities.

[0067] Preferably, the first cylinder 3210 includes a first inner cylinder 3212 and a first outer cylinder 3211, which cooperate to form the first cavity. The third chamber C includes a portion formed within the first inner cylinder 3212 and extending toward the first pressure member 3216. The first chamber A may include a portion formed within the first outer cylinder 3211.

[0068] Preferably, in order to facilitate assembly, the first outer cylinder body 3211 can be constructed of a split structure. Specifically, the first outer cylinder body 3211 includes a body and an end cover, wherein the end cover is fixedly connected to the axial end of the body.

[0069] The first piston assembly 3215 may be an integrated structure, but for ease of assembly, the first piston assembly 3215 may also be constructed of a split structure. Specifically, the first piston assembly 3215 includes a first part 3213 and a second part 3214 .

[0070] The working principle of the first locking mechanism 321 is described below by taking the example that both the first chamber A and the second chamber B are connected to the gas source.

[0071] like Figure 4 As shown, when the first chamber A is in an inflated state and the second chamber B is in an exhausted state, the compressed gas acts on one end of the second part 3214 of the first piston assembly 3215 to push the second part 3214 to move toward the third chamber C side, and then the second part 3214 pushes the first part 3213 of the first piston assembly 3215 to move toward the third chamber C side to squeeze the force transmission medium in the third chamber C and the groove D. The generated pressure acts on the first pressing member 3216, and the first pressing member 3216 undergoes elastic deformation after being squeezed to lock the hollow main shaft 1. The first locking mechanism 321 will not move axially relative to the hollow main shaft 1, so that the drum spacing between the two half-drum devices 3 remains unchanged.

[0072] On the contrary, if Figure 2As shown, when the first chamber A is in the exhaust state while the second chamber B is in the inflation state, the compressed gas acts on the other end of the second part 3214 of the first piston assembly 3215 to push the second part 3214 to move towards the first chamber A side, so that the force applied to the first part 3213 of the first piston assembly 3215 through the second part 3214 of the first piston assembly 3215 disappears, and then the pressure applied to the first pressure- bearing member 3216 by the first part 3213 through the force transmission medium disappears, the first pressure-bearing member 3216 returns to the original state, and the hollow spindle 1 is loosened, at the same time, the first part 3213 of the first piston assembly 3215 is also driven by the force transmission medium to move towards the first chamber A side.

[0073] If the first part 3213 and the second part 3214 of the first piston assembly 3215 are fixedly connected, when the first chamber A is in the inflation state while the second chamber B is in the exhaust state, the compressed gas acts on one end of the second part 3214 of the first piston assembly 3215 to push the entire first piston assembly 3215 to move towards the third chamber C side, and when the first chamber A is in the exhaust state while the second chamber B is in the inflation state, the compressed gas acts on the other end of the second part 3214 of the first piston assembly 3215 to push the entire first piston assembly 3215 to move towards the first chamber A side.

[0074] To ensure the sealing of the first chamber A, the second chamber B and the third chamber C, at least one sealing ring is arranged between the first piston assembly 3215 and the first inner cylinder body 3212 and the first outer cylinder body 3211, between the first inner cylinder body 3212 and the first outer cylinder body 3211, and between the first pressure-bearing member 3216 and the first inner cylinder body 3212 and the first outer cylinder body 3211.

[0075] As shown in Figure 2 and Figure 4 , the second locking mechanism 322 in the interlocking mechanism 32 can adopt the same linkage structure as the first locking mechanism 321.

[0076] Specifically, the second locking mechanism 322 includes a second pressure-bearing member 3226 and a second cylinder body 3220 arranged in the outer shaft 31 from the inside to the outside in sequence, the second pressure-bearing member 3226 is sealingly connected with the second cylinder body 3220, the second cylinder body 3220 forms a second cavity inside, the second cavity extends towards the second pressure-bearing member 3226, the second cavity is filled with a force transmission medium, and the second locking mechanism 322 further includes a second piston assembly 3225 accommodated in the second cavity, the second piston assembly can move in the second cavity to extrude the force transmission medium.

[0077] Preferably, the second piston assembly 3225 divides the second cavity into a fourth chamber E, a fifth chamber F and a sixth chamber G, which are arranged in sequence. The sixth chamber G extends toward the second pressure piece 3226. The force transmission medium is filled in the sixth chamber G. The force transmission medium is preferably liquid plastic. The fourth chamber E can be connected to an air source or a hydraulic source, so that the second piston assembly 3225 can squeeze the force transmission medium in the sixth chamber G under the action of pneumatic or hydraulic pressure, and the generated pressure acts on the second pressure piece 3226 to deform it to lock the outer shaft 31; and the fifth chamber F can also be connected to an air source or a hydraulic source, or a number of elastic parts such as springs can be arranged in the fifth chamber F along the axial direction of the second piston assembly 3225 to drive the second piston assembly 3225 to move toward the side of the fourth chamber E to release the squeezing of the force transmission medium in the sixth chamber G, so that the second pressure piece 3226 returns to its original state to release the outer shaft 31.

[0078] Preferably, the second pressure member 3226 is also a thin-walled sleeve, both ends of which are tightly attached to the wall of the second cylinder body 3220, and a groove H is formed in the middle thereof, which is connected to the sixth chamber G. The groove H is also filled with the above-mentioned force transmission medium, and the groove H is composed of one or more annular grooves or a plurality of grooves evenly distributed along the circumferential direction.

[0079] Preferably, a plurality of second cavities are evenly formed in the second cylinder 3220 , and the plurality of second piston assemblies 3225 are respectively accommodated in the plurality of second cavities.

[0080] Preferably, the second cylinder 3220 includes a second inner cylinder 3222 and a second outer cylinder 3221, which cooperate to form the second cavity. The sixth chamber G includes a portion formed within the second inner cylinder 3222 and extending toward the second pressure member 3226. The fourth chamber E may include a portion formed within the second outer cylinder 3221.

[0081] Preferably, the second outer cylinder 3221 may include a main body and an end cover, wherein the end cover is fixedly connected to the axial end of the main body; thereby, the connecting assembly 40 (specifically, the connecting component 43) can be connected to the main body or end cover of the second outer cylinder 3221 in the corresponding second locking mechanism 322, and one end of the booster link 352 can be pivotally connected to the main body or end cover of the second outer cylinder 3221 in the second locking mechanism 322.

[0082] The second piston assembly 3225 may be an integrated structure, but for ease of assembly, the second piston assembly 3225 may also be a split structure. Specifically, the second piston assembly 3225 includes a first part 3223 and a second part 3224 .

[0083] The working principle of the second locking mechanism 322 is described below by taking the fourth chamber E and the fifth chamber F as an example in which both the fourth chamber E and the fifth chamber F are connected to the gas source.

[0084] like Figure 2 As shown, when the fourth chamber E is in an inflated state and the fifth chamber F is in an exhausted state, the compressed gas acts on one end of the second part 3224 of the second piston assembly 3225 to push the second part 3224 to move toward the sixth chamber G side, and then the second part 3224 pushes the first part 3223 of the second piston assembly 3225 to move toward the sixth chamber G side to squeeze the force transmission medium in the sixth chamber G. The generated pressure acts on the second pressure piece 3226, and the second pressure piece 3226 undergoes elastic deformation after being squeezed to lock the outer shaft 31. The second locking mechanism 322 will not move axially relative to the outer shaft 31.

[0085] On the contrary, if Figure 4 As shown, when the fourth chamber E is in the exhaust state and the fifth chamber F is in the inflation state, the compressed gas acts on the other end of the second part 3224 of the second piston assembly 3225 to push the second part 3224 to move toward the fourth chamber E side, so that the force applied to the first part 3223 of the second piston assembly 3225 by the second part 3224 of the second piston assembly 3225 disappears, and then the pressure applied by the first part 3223 to the second pressure member 3226 through the force transmission medium disappears, the second pressure member 3226 returns to its original state, and the outer shaft 31 is released. At the same time, the second part 3223 of the second piston assembly 3215 also moves toward the fourth chamber E side driven by the force transmission medium.

[0086] If the first part 3223 of the second piston assembly 3225 is fixedly connected to the second part 3224, then when the fourth chamber E is in the inflated state and the fifth chamber F is in the exhausted state, the compressed gas acts on one end of the second part 3224 of the second piston assembly 3225 to push the entire second piston assembly 3225 toward the sixth chamber G side, and when the fourth chamber E is in the exhausted state and the fifth chamber F is in the inflated state, the compressed gas acts on the other end of the second part 3224 of the second piston assembly 3225 to push the entire second piston assembly 3225 toward the fourth chamber E side.

[0087] In embodiment one, in order to realize the alternating interlocking function of the first locking mechanism 321 and the second locking mechanism 322 of the interlocking mechanism 32, the first chamber A in the first locking mechanism 321 and the fifth chamber F in the second locking mechanism 322 are simultaneously connected to one air source or hydraulic source to simultaneously inflate or exhaust the second chamber B in the first locking mechanism 321 and the fourth chamber E in the second locking mechanism 322 are simultaneously connected to another air source or hydraulic source to simultaneously inflate or exhaust the air.

[0088] In addition, if Figure 5-8 As shown, the present invention also provides an alternative embodiment 2, in which the tire building drum 100 provided in the second embodiment differs from the tire building drum 100 provided in the first embodiment only in that the second locking mechanism 322' in the interlocking mechanism 32' can adopt another structure. This structure can also achieve a better locking effect.

[0089] The second locking mechanism 322' includes a second elastic member 3224' and a second cylinder 3220' arranged in sequence from the inside to the outside around the outer shaft 31. The second cylinder 3220' is clamped at both ends of the second elastic member 3224' to limit the axial movement of the second elastic member 3224' relative to the second cylinder 3220'. A second cavity is formed in the second cylinder 3220'. The second locking mechanism 322' also includes a second piston assembly 3223' accommodated in the second cavity and movable axially along the outer shaft 31. The second piston assembly 3223' also forms a conical surface fit with the radial outer side of the second elastic member 3224'. A fourth chamber E' and a fifth chamber F' are formed on both axial sides of the second piston assembly 3223'. The fourth chamber E' and the fifth chamber F' can be connected to an air source or a hydraulic source. Thus, the second piston assembly 3223' can move axially along the outer shaft 31 under the action of pneumatic or hydraulic pressure to squeeze the second elastic member 3224'. The second elastic member 3224' can contract radially under the extrusion action to lock the outer shaft 31.

[0090] Preferably, for ease of assembly, the second cylinder 3220' can be constructed in a split structure. Specifically, the second cylinder 3220' includes a second outer cylinder 3221' and a second end cover 3222', wherein the second end cover 3222' is fixedly connected to the axial end of the second outer cylinder 3221'.

[0091] In addition, in order to ensure the sealing of the fourth chamber E' and the fifth chamber F', at least one sealing ring is provided between the second outer cylinder body 3221' and the second end cover 3222', between the second outer cylinder body 3221' and the second end cover 3222' and the outer shaft 31, and between the second piston assembly 3223' and the second outer cylinder body 3221'.

[0092] Below, taking the fourth chamber E' and the fifth chamber F' both connected to the gas source as an example, the working principle of the second locking mechanism 322' is explained as follows:

[0093] like Figure 6 As shown, when the fourth chamber E' is in the inflated state and the fifth chamber F' is in the exhausted state, the second piston assembly 3223' moves axially toward the side close to the middle ring 2, squeezing the second elastic member 3224', and the second elastic member 3224' locks the outer shaft 31. On the contrary, Figure 8As shown, when the fourth chamber E' is in the exhaust state and the fifth chamber F' is in the inflation state, the second piston assembly 3223' moves axially away from the middle ring 2, the second piston assembly 3223' releases the squeezing of the second elastic member 3224', and the second elastic member 3224' releases the outer shaft 31.

[0094] In implementation two, in order to realize the alternating interlocking function of the first locking mechanism 321 and the second locking mechanism 322' in the interlocking mechanism 32', the first chamber A in the first locking mechanism 321 and the fifth chamber F' in the second locking mechanism 322' are simultaneously connected to one air source or hydraulic source for simultaneous inflation or exhaust, and the second chamber B in the first locking mechanism 321 and the fourth chamber E' in the second locking mechanism 322' are simultaneously connected to another air source or hydraulic source for simultaneous inflation or exhaust.

[0095] In summary, the present invention provides a tire building drum and a tire building machine having the same. The tire building drum utilizes a back-up boosting mechanism comprised of a boosting plate and a boosting connecting rod to provide a boosting force for the back-up capsule, thereby providing the tire building drum with the advantages of consistent back-up height and high production efficiency, as well as good back-up circumferential continuity and uniform force distribution. Furthermore, the spacing adjustment and back-up boosting action of the two halves of the tire building drum are accomplished by a single ball screw drive pair in conjunction with an alternating locking interlocking mechanism comprised of a first locking mechanism and a second locking mechanism. This significantly simplifies the mechanical structure of the tire building drum, further simplifying the drum control process and enabling the tire building drum to meet the requirements of lightweighting, simplification, and miniaturization. Again, in the interlocking mechanism of the tire building drum of the present invention, the first and second locking mechanisms are a linkage structure. First, under the action of pneumatic or hydraulic pressure, the first and second piston assemblies are moved in the first and second cylinder bodies. Then, the first and second piston assemblies squeeze the force transmission medium sealed in the chamber (such as the third and sixth chambers) to generate a large pressure. This pressure acts on the first and second pressure members to deform them to position and lock the main shaft and the outer shaft. This linkage structure can achieve a better locking effect under the same pneumatic or hydraulic driving force conditions. Preferably, the force transmission medium is liquid plastic. By utilizing the incompressibility of liquid plastic, the pressure can be evenly transmitted to the pressure member, and the main shaft or the outer shaft can be positioned and clamped by the deformation of the pressure member, so that it has the characteristics of uniform and reliable clamping. Moreover, the above-mentioned pressure can be as high as tens or even hundreds of MPa, that is, a larger force multiplication ratio is obtained under the same pneumatic or hydraulic driving force conditions, which can achieve a better locking effect. In addition, liquid plastic also has the characteristics of stable performance and not easy to leak, and can be used for a long time without maintenance.

[0096] The specific examples described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tire building drum (100), comprising: A main shaft (1) and two half-drum devices (3) symmetrically mounted on the main shaft (1); characterized in that each of the half-drum devices (3) comprises: An outer shaft (31) is sleeved outside the main shaft (1); An interlocking mechanism (32, 32') comprises a first locking mechanism (321) and a second locking mechanism (322, 322') for alternate locking, wherein the first locking mechanism (321) is sleeved on the main shaft (1) and can lock or release the main shaft (1), and the second locking mechanism (322, 322') is sleeved on the outer shaft (31) and can lock or release the outer shaft (31), and the first locking mechanism (321) is also fixedly connected to the outer shaft (31); An inverted capsule (34) capable of switching between a vacuum state and an inflated state; and A reverse boosting mechanism (35) comprising a plurality of boosting plates (351) and a plurality of boosting connecting rods (352) uniformly distributed along a circumference, wherein one end of the boosting connecting rod (352) is pivotally connected to the boosting plate (351), and the other end of the boosting connecting rod (352) is pivotally connected to the second locking mechanism (322); When the first locking mechanism (321) locks the main shaft (1) and the second locking mechanism (322) releases the outer shaft (31), the second locking mechanism (322) can move axially along the outer shaft (31) to drive the boosting connecting rod (352) so that the boosting plate (351) flips radially outward of the half-drum device (3), thereby providing a boosting force for the reversed capsule (34) in the inflated state; The first locking mechanism (321) includes a first pressure piece (3216) and a first cylinder (3210) arranged in sequence from the inside to the outside around the main shaft (1), the first pressure piece (3216) is sealedly connected to the first cylinder (3210), a first cavity is formed in the first cylinder (3210), the first cavity extends toward the first pressure piece (3216), and the first cavity is filled with a force transmission medium. The first locking mechanism (321) also includes a first piston assembly (3215) accommodated in the first cavity, the first piston assembly (3215) can move in the first cavity to squeeze the force transmission medium to generate pressure, and the pressure acts on the first pressure piece (3216) to deform it to lock the main shaft (1).

2. A tire building drum according to claim 1, characterized in that: The tire building drum (100) further comprises a transmission assembly (4) for driving the two half-drum devices (3), wherein the transmission assembly (4) comprises a ball screw (41) and two groups of connecting assemblies (40) mounted on the ball screw (41) and drivingly engaged with the ball screw (41), wherein the two groups of connecting assemblies (40) are respectively connected to the second locking mechanisms (322, 322') in the corresponding half-drum devices (3).

3. A tire building drum according to claim 2, characterized in that: The ball screw (41) is symmetrically provided with threads with equal pitches but opposite directions; the connecting assembly (40) comprises a transmission nut (42) and a connecting component (43); the transmission nut (42) is threadedly connected to the ball screw (41); one end of the connecting component (43) is connected to the transmission nut (42), and the other end is connected to the second locking mechanism (322, 322') in the corresponding half-drum device (3).

4. A tire building drum according to claim 3, characterized in that: The main shaft (1) has a hollow structure, the ball screw (41) is coaxially arranged inside the main shaft (1), the main shaft (1) and the outer shaft (31) are respectively provided with a slide groove (x) and a slide groove (y) arranged along the axial direction, and the connecting component (43) passes through the slide groove (x) and the slide groove (y) in sequence to be connected to the second locking mechanism (322, 322').

5. The tire building drum according to claim 1, characterized in that: The first piston assembly (3215) divides the first cavity into a first chamber (A), a second chamber (B) and a third chamber (C) which are arranged in sequence. The third chamber (C) extends toward the first pressure member (3216). The force transmission medium is filled in the third chamber (C). The first chamber (A) is connected to an air source or a hydraulic source. The first piston assembly (3215) can move in the first cylinder body (3210) under the action of pneumatic or hydraulic pressure to squeeze the force transmission medium in the third chamber (C) to generate pressure. The pressure acts on the first pressure member (3216) to deform it to lock the main shaft (1).

6. A tire building drum according to claim 5, characterized in that: The first pressure member (3216) is a sleeve, both ends of which are tightly attached to the wall of the first cylinder body (3210), and a groove (D) is formed in the middle thereof, and the groove (D) is connected to the third chamber (C). The groove (D) is also filled with the force transmission medium, and the groove (D) is composed of one or more annular grooves or a plurality of grooves evenly distributed along the circumferential direction.

7. A tire building drum according to claim 2, characterized in that: The second locking mechanism (322) includes a second pressure piece (3226) and a second cylinder (3220) arranged in sequence from the inside to the outside around the outer shaft (31), the second pressure piece (3226) is sealedly connected to the second cylinder (3220), a second cavity is formed in the second cylinder (3220), the second cavity extends toward the second pressure piece (3226), and the second cavity is filled with a force transmission medium. The second locking mechanism (322) also includes a second piston assembly (3225) accommodated in the second cavity, the second piston assembly (3225) can move in the second cavity to squeeze the force transmission medium to generate pressure, and the pressure acts on the second pressure piece (3226) to deform it to lock the outer shaft (31).

8. The tire building drum according to claim 7, characterized in that: The second piston assembly (3225) divides the second cavity into a fourth chamber (E), a fifth chamber (F) and a sixth chamber (G) which are arranged in sequence. The sixth chamber (G) extends toward the second elastic member (3224'), and the force transmission medium is filled in the sixth chamber (G); the fourth chamber (E) is connected to an air source or a hydraulic source, and the second piston assembly (3225) can move in the second cylinder body (3220) under the action of pneumatic or hydraulic pressure to squeeze the force transmission medium in the sixth chamber (G) to generate pressure, and the pressure acts on the second pressing member (3226) to deform it to lock the outer shaft (31).

9. A tire building drum according to claim 8, characterized in that: The second pressure member (3226) is a sleeve, both ends of which are tightly attached to the wall of the second cylinder body (3220), and a groove (H) is formed in the middle thereof, the groove (H) is connected to the sixth chamber (G), and the groove (H) is also filled with the force transmission medium. The groove (H) is composed of one or more annular grooves or a plurality of grooves evenly distributed along the circumferential direction.

10. The tire building drum according to claim 7, characterized in that: The connecting assembly (40) is connected to the second cylinder (3220) of the corresponding second locking mechanism (322); one end of the boosting connecting rod (352) is pivotally connected to the boosting plate (351), and the other end is pivotally connected to the second cylinder (3220) of the second locking mechanism (322).

11. A tire building drum according to any one of claims 1 or 5-9, characterized in that: The force transmission medium is liquid plastic.

12. The tire building drum according to claim 1, characterized in that: The second locking mechanism (322') includes a second elastic member (3224') and a second cylinder (3220') sequentially arranged around the outer shaft (31) from the inside to the outside. The second cylinder (3220') is clamped at both ends of the second elastic member (3224'). A second cavity is formed in the second cylinder (3224'). The second locking mechanism (322') also includes a second piston assembly (3223') accommodated in the second cavity. A conical surface is formed between the second piston assembly (3223') and the radial outer side of the second elastic member (3224'). The second piston assembly (3223') divides the second cavity into a fourth chamber (E') and a fifth chamber (F'). The second piston assembly (3223') can move axially along the outer shaft under pneumatic or hydraulic action to squeeze the second elastic member (3224'). After being squeezed, the second elastic member (3224') can contract radially to lock the outer shaft (31).

13. A tire building drum according to any one of claims 1 to 10 and 12, characterized in that: The release control of the first locking mechanism (321) and the locking control of the second locking mechanism (322, 322') are realized by the same air source or hydraulic source, and the locking control of the first locking mechanism (321) and the release control of the second locking mechanism (322, 322') are realized by the same air source or hydraulic source.

14. A tire building machine, comprising the tire building drum according to any one of claims 1 to 13.

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