阅读说明：本技术 轮胎成型鼓 (Tyre building drum ) 是由 郝祥印 吴从高 曹晓明 于 2018-05-31 设计创作，主要内容包括：本发明公开了一种轮胎成型鼓,包括主轴及围绕主轴设置的两个半鼓,每个半鼓包括互锁装置以及一端枢接于互锁装置的反包单元,互锁装置包括套设在主轴上的第一锁紧机构以及第二锁紧机构,第一锁紧机构包括绕主轴由内至外依次设置的抵压件和第一缸体,第一缸体设有第一腔体,第一腔体内具有传力介质且第一腔体朝向抵压件延伸,第一锁紧机构还包括收容于第一腔体内的第一活塞,第一活塞可在第一腔体内轴向或径向移动以压缩传力介质产生压力,该压力作用于抵压件使其锁紧主轴。本发明通过第一锁紧机构和第二锁紧机构形成交替式互锁结构,从而可以完成反包、定型工序,简化成型鼓结构,优化成型效果。(The invention discloses a tire building drum which comprises a main shaft and two half drums arranged around the main shaft, wherein each half drum comprises an interlocking device and a reverse packing unit, one end of the reverse packing unit is pivoted to the interlocking device, the interlocking device comprises a first locking mechanism and a second locking mechanism, the first locking mechanism is sleeved on the main shaft and comprises a pressing piece and a first cylinder body, the pressing piece and the first cylinder body are sequentially arranged from inside to outside around the main shaft, the first cylinder body is provided with a first cavity, a force transmission medium is arranged in the first cavity, the first cavity extends towards the pressing piece, the first locking mechanism further comprises a first piston accommodated 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 piece to lock the main shaft. According to the invention, the first locking mechanism and the second locking mechanism form an alternating interlocking structure, so that the processes of turning up and shaping can be completed, the structure of the forming drum is simplified, and the forming effect is optimized.)

1. A tyre building drum comprising: the device comprises a main shaft, a lead screw positioned in the main shaft, two half drums arranged around the main shaft and a connecting component for respectively connecting the two half drums to the lead screw,

Each half-drum comprises an outer shaft sleeve sleeved on the main shaft, an interlocking device and a reverse-wrapping unit with one end pivoted to the interlocking device, the interlocking device comprises a first locking mechanism sleeved on the main shaft and fixed at one end of the outer shaft sleeve and a second locking mechanism sleeved on the outer shaft sleeve, and when the main shaft is locked by the first locking mechanism, the outer shaft sleeve is loosened by the second locking mechanism; when the first locking mechanism loosens the main shaft, the second locking mechanism locks the outer shaft sleeve, and the connecting assembly is fixedly connected with the second locking mechanism;

The first locking mechanism comprises a pressing piece and a first cylinder body which are sequentially arranged around the main shaft from inside to outside, the first cylinder body is provided with a first cavity, a force transmission medium is arranged in the first cavity, the first cavity extends towards the pressing piece, the first locking mechanism further comprises a first piston accommodated in the first cavity, 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 piece to lock the main shaft.

2. Tyre building drum according to claim 1, in which the force transfer medium is liquid plastic.

3. Tire building drum according to claim 1, wherein the second locking mechanism is structurally identical to the first locking mechanism.

4. Tyre building drum according to claim 1, in which the first cylinder comprises a first inner cylinder and a first outer cylinder, the first inner cylinder cooperating with the first outer cylinder to form a first cavity.

5. Tyre building drum according to claim 1, in which the abutment member is provided with a radially recessed groove, the first cavity communicating with the groove.

6. Tyre building drum according to claim 1, wherein the first locking mechanism further comprises a first resilient member between the spindle and the abutment member, the pressure force causing the abutment member to abut against the first resilient member, the first resilient member being deformed to embrace the spindle.

7. Tyre building drum according to claim 1, in which the first piston divides the first cavity into a first chamber and a second chamber, the second chamber extending towards the press and the force transfer medium being located in the second chamber, the first piston being radially movable in the first chamber to compress the force transfer medium in the second chamber.

8. Tyre building drum according to claim 1, characterised in that the first piston comprises a first part and a second part, which first part and second part divide the first cavity into a first chamber, a second chamber and a third chamber, which second chamber extends towards the press part, which second part together with the force transfer medium is located in the second chamber, which first part is located in the first chamber and the third chamber.

9. Tyre building drum according to claim 8, wherein the first part is provided with a recess for clamping one end of the second part, which recess is adapted to hold one end of the second part, and wherein the first part is adapted to push the second part via the recess in an axial direction along the spindle for compressing the force transfer medium in the second chamber.

10. Tyre building drum according to claim 1, wherein the second locking mechanism comprises a second elastic element and a second cylinder around the outer sleeve and arranged in sequence from inside to outside, the second cylinder engaging with both ends of the second elastic element.

11. Tyre building drum according to claim 10, wherein a second cavity is formed between the second resilient element and the second cylinder, the second cavity housing a second piston, the second piston being axially displaceable along the spindle by gas or liquid.

12. Tire building drum according to claim 11, wherein the second resilient element consists of two conical elements arranged around the outer sleeve, the conical elements being semi-circular rings with a gap between them, the semi-circular rings being cone-fitted with the second piston.

13. Tyre building drum according to any one of claims 1-12, wherein the release control of the first locking mechanism and the locking control of the second locking mechanism are performed by the same air or hydraulic source and the locking control of the first locking mechanism and the release control of the second locking mechanism are performed by the same air or hydraulic source.

14. Tyre building drum according to claim 1, in which the coupling assembly comprises two drive nuts on either side of the lead screw and screwed to the lead screw, and a coupling piece fixedly connecting the drive nuts and the half-drum.

15. Tyre building drum according to any one of claims 1-12 or 14, wherein each of the half-drums further comprises a turn-up bar guide disc fixed to the other end of the outer sleeve, the turn-up unit comprising a plurality of turn-up bars circumferentially distributed, each turn-up bar having a first end pivotally connected to the second locking mechanism and a second end freely resting on the turn-up bar guide disc.

Technical Field

The invention relates to the technical field of tire forming equipment, in particular to a tire forming drum.

Background

The existing one-step tire building drum is disclosed in chinese patent No. CN201080001988.3 of VMI netherlands. The tire building drum is provided with two screw rods, wherein one screw rod drives a group of mutually nested push-pull rods to realize the push-pull movement of the push-pull rods through the opposite thread directions of the screw rods, so that the relative movement of the two half drums is realized. The other screw rod drives the other group of mutually nested push-pull rods to pass through the opposite thread directions of the screw rods, so that the push-pull movement of the push-pull rods is realized, and the turn-up action of the two groups of turn-up rods is realized. The structure needs four push-pull rods and two independently controlled screw rods which are mutually nested and coaxially arranged, and the push-pull rods and the screw rods are both positioned in the main case, so that the structure of the tire forming drum is complex, the interchangeability and the universality of the whole forming machine are poor, and the control of the turn-up action and the shaping action of the tire forming drum during tire forming is complicated.

disclosure of Invention

The invention aims to provide a tire building drum which is simple in structure and convenient to control.

In order to achieve the purpose, the invention adopts the following technical scheme: a tyre building drum comprising: a main shaft, a lead screw positioned in the main shaft, two half drums arranged around the main shaft and connecting components respectively connecting the two half drums to the lead screw,

Each half-drum comprises an outer shaft sleeve sleeved on the main shaft, an interlocking device and a reverse-wrapping unit with one end pivoted to the interlocking device, the interlocking device comprises a first locking mechanism sleeved on the main shaft and fixed at one end of the outer shaft sleeve and a second locking mechanism sleeved on the outer shaft sleeve, and when the main shaft is locked by the first locking mechanism, the outer shaft sleeve is synchronously loosened by the second locking mechanism; when the first locking mechanism loosens the main shaft, the second locking mechanism synchronously locks the outer shaft sleeve, and the connecting assembly is fixedly connected with the second locking mechanism;

The first locking mechanism comprises a pressing piece and a first cylinder body which are sequentially arranged around the main shaft from inside to outside, the first cylinder body is provided with a first cavity, a force transmission medium is arranged in the first cavity, the first cavity extends towards the pressing piece, the first locking mechanism further comprises a first piston accommodated in the first cavity, the pressing piece can move in the first cavity to compress the force transmission medium to generate pressure, and the pressure acts on the pressing piece to lock the main shaft.

Further, the force transfer medium is liquid plastic.

Further, the second locking mechanism is identical in structure to the first locking mechanism.

Further, the first cylinder includes a first inner cylinder and a first outer cylinder, the first inner cylinder cooperating with the first outer cylinder to form a first cavity.

Further, the pressing piece is provided with a groove which is radially recessed, and the first cavity is communicated with the groove.

Furthermore, the first locking mechanism further comprises a first elastic piece located between the main shaft and the pressing piece, the pressing piece presses against the first elastic piece through the pressure, and the first elastic piece deforms and then embraces the main shaft tightly.

Further, the first piston divides the first cavity into a first chamber and a second chamber, the second chamber extending toward the pressing member and the force transfer medium being located within the second chamber, the first piston being radially movable within the first chamber to compress the force transfer medium within the second chamber.

further, the first piston includes a first portion and a second portion that divide the first cavity into a first chamber, a second chamber, and a third chamber, the second chamber extending toward the pressing member, the second portion and the force transfer medium both being located within the second chamber, the first portion being located within the first chamber and the third chamber.

Furthermore, the first portion is provided with a recessed portion clamped at one end of the second portion, the recessed portion can limit one end of the second portion, and the first portion pushes the second portion to move axially along the spindle through the recessed portion so as to compress the force transmission medium in the second chamber.

Furthermore, second locking mechanism is including winding outer axle sleeve and from interior to exterior set gradually second elastic component and second cylinder body, second cylinder body joint the both ends of second elastic component.

Further, a second cavity is formed between the second elastic piece and the second cylinder, a second piston is accommodated in the second cavity, and the second piston can be driven by gas or liquid to move axially along the main shaft.

Further, the second elastic component is by two winds the toper piece that outer axle sleeve set up constitutes, the toper piece is the semicircle ring body, two have the clearance between the semicircle ring body, the semicircle ring body with the cooperation of second piston conical surface.

Furthermore, the unlocking 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, and the locking control of the first locking mechanism and the unlocking control of the second locking mechanism are realized by the same air source or hydraulic source.

Further, coupling assembling is including being located respectively the both sides of lead screw and threaded connection two drive nuts and the fixed connection of lead screw drive nut with the connecting piece of half drum.

furthermore, each half drum still including be fixed in the anti-package pole positioning disk of the outer axle sleeve other end, anti-package unit includes a plurality of along the anti-package pole of circumferencial direction distribution, every anti-package pole is equipped with first end and second end, first end pin joint in second locking mechanism, the second end freely place in on the anti-package pole positioning disk.

Further, the turn-up rod comprises a first state parallel to the main shaft and a second state arranged at an angle with the main shaft, when the main shaft is locked by the first locking mechanism, the outer shaft sleeve is loosened by the second locking mechanism, the second locking mechanism can axially move along the main shaft, and the turn-up rod can be switched between the first state and the second state.

In the invention, when the first locking mechanism locks the main shaft, the second locking mechanism can synchronously loosen the outer shaft sleeve, and at the moment, the screw rod rotates, so that the second locking mechanism can axially move on the outer shaft sleeve, the first end of the turn-up rod pivoted to the second locking mechanism can axially move along the main shaft, and the second end of the turn-up rod can be matched with a tire component on the tire building drum to perform turn-up action; when the first locking mechanism loosens the main shaft, the second locking mechanism synchronously locks the outer shaft sleeve, and the first locking mechanism, the second locking mechanism and the outer shaft sleeve cannot move relatively, so that when the screw rod rotates, the second locking mechanism and the outer shaft sleeve can be driven to move axially, and the first locking mechanism is driven to move axially, namely the whole half drum moves axially, so that the distance between the two half drums can be adjusted, and the tire forming drum is matched with a tire forming drum to complete the shaping process of a tire component.

(1) In the tire building drum, the first locking mechanism is provided with the first cylinder body, the first piston, the first chamber and the second chamber, so that when the first piston is driven by air pressure to move in the first cylinder body, the first piston can compress a force transmission medium in the second chamber, huge pressure is generated instantly after the force transmission medium is compressed, the pressure intensity can reach hundreds of megapascals, the pressure can directly act on the pressing piece, and the pressing piece tightly holds the spindle, so that the pressure generated by the linkage structure is higher than the pure air pressure under the condition of the same pneumatic driving force, and the holding effect is better.

(2) in the tire building drum, the distance adjustment and the turn-up boosting action of the two half drums are only matched by the screw-nut pair, and are simultaneously completed by the cooperation of the alternating locking interlocking device consisting of the first locking mechanism and the second locking mechanism, so that the mechanical structure is greatly simplified, the control process is simpler, and the tire building drum can meet the requirements of light weight, simplification and miniaturization.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

Fig. 1 is a cross-sectional view of a first state (first locking mechanism a released, second locking mechanism B' clasped) of a first locking mechanism a of a tire building drum of embodiment 4 of the present invention.

Fig. 2 is a sectional view of the tire building drum of embodiment 4 of the present invention in a second state (the first locking mechanism a is clasped and the second locking mechanism B' is unclamped).

Fig. 3 is a cross-sectional view of a first state of the first locking mechanism a (first locking mechanism a released, second locking mechanism B tightened) of the tire building drum of embodiment 1 of the present invention.

Fig. 4 is a sectional view of the tire building drum of embodiment 1 of the present invention in a second state (the first locking mechanism a is clasped and the second locking mechanism B is released).

Fig. 5 is a cross-sectional view of a first state (first locking mechanism a released, second locking mechanism B tightened) of the first locking mechanism a of the tire building drum of embodiment 2 of the present invention.

Fig. 6 is a sectional view of the tire building drum of embodiment 2 of the present invention in a second state (the first locking mechanism a is clasped and the second locking mechanism B is released).

Fig. 7 is a cross-sectional view of the first state of the first locking mechanism a (the first locking mechanism a is released and the second locking mechanism B is tightened) of the tire building drum of embodiment 3 of the present invention.

Fig. 8 is a partially enlarged view of fig. 1.

Fig. 9 is a partially enlarged view of fig. 1.

Fig. 10 is a partially enlarged view of fig. 5.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 to 10, the present invention discloses a tire building drum 100, which comprises a main shaft 1, a middle ring (not shown) sleeved on the main shaft 1, and two half drums which are substantially symmetrical with respect to the middle ring and are arranged around the main shaft 1. Each half-drum comprises two outer shaft sleeves 3 which are sleeved on the main shaft 1 and are symmetrical relative to the middle ring, and the two outer shaft sleeves 3 are respectively positioned on two sides of the middle ring and can move along the axial direction of the main shaft 1. Fig. 1 to 5 show only a half drum structure of the tire building drum 100.

The tire building drum 100 further comprises a screw rod 4 and a connecting component, wherein the screw rod 4 is located in the main shaft 1 and is coaxial with the main shaft 1, the connecting component is used for connecting the screw rod 4 and the half drums, and the screw rod 4 rotates to sequentially drive the connecting component and the two half drums to move relatively along the axial direction of the main shaft 1. The connecting assembly comprises two transmission nuts 5 which are respectively positioned on two sides of the screw rod and are in threaded connection with the screw rod 4, and a connecting piece 6 which is fixedly connected with the transmission nuts 5 and the half drum. Wherein, on both sides of the tyre building drum 100, the screw thread directions of the screw rods 4 are opposite and the screw pitches are equal, and the two half drums are respectively fixedly connected with the corresponding transmission nuts 5 through the connecting pieces 6. Therefore, the rotation of the screw rod 4 can drive the two transmission nuts 5 to axially move oppositely or back to back, so that the connecting piece 6 and the two half drums can be driven to axially move oppositely or back to back. It should be noted that the main shaft 1 and the outer sleeve 3 are respectively provided with a key slot (not numbered) so that the connecting member 6 extends into the main shaft 1 from the key slot to connect with the driving nut 5.

As shown in fig. 1 to 7, each half drum further comprises an interlocking device 7 disposed far from the middle ring, a turn-up rod guide disc 8 disposed near the middle ring, and a turn-up unit having a plurality of turn-up rods 9 distributed in the circumferential direction. The turn-up bar 9 has a first end 91 and a second end 92, the first end 91 being pivotally connected to the interlocking means 7 and the second end 92 being freely placed on the turn-up bar guide plate 8. Further, the turnup rod 9 comprises a first state substantially parallel to the main shaft 1 and a second state intersecting the main shaft 1 at an angle. When the second end 92 of the turnup rod 9 is gradually away from the spindle 1, the turnup rod 9 can be switched from the first state to the second state, so that the components of the tire can be turned up. When the second end 92 of the turn-up lever 9 is gradually close to the spindle 1, the turn-up lever 9 can be switched from the second state to the first state, so that the reset of the turn-up lever 9 can be realized to prepare for the next turn-up process.

As shown in fig. 1 to 7, the interlocking device 7 includes a first locking mechanism a sleeved on the main shaft 1 and axially connected to 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 turnup rod guide disc 8. The first locking mechanism a can lock the main shaft 1, and the second locking mechanism B can lock the outer sleeve 3. Furthermore, the second locking mechanism B is fixedly connected with the transmission nut 5 through the connecting piece 6, and one side of the second locking mechanism B is pivoted with the first end 91 of the turn-up rod 9, so that the rotation of the screw rod 4 can sequentially drive the transmission nut 5, the connecting piece 6, the second locking mechanism B and the first end 91 of the turn-up rod 9 to axially move on the outer shaft sleeve 3, and thus the turn-up process of the tire component can be completed. 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 move along the axial direction of the main shaft 1, and the turn-up rod 9 can be switched between a first state and a second state.

As shown in fig. 1 to 6, 8, and 9, the first locking mechanism a includes a first elastic member 10, a pressing member 11, and a first cylinder, which are sequentially disposed around the main shaft 1 from inside to outside. The first cylinder body comprises a first inner cylinder body 12 and a first outer cylinder body 13, a first cavity extending along the axial direction of the main shaft 1 is formed between the first inner cylinder body 12 and the first outer cylinder body 13, a force transmission medium is arranged in the first cavity, and the first cavity extends towards the pressing piece. The first locking mechanism A further comprises a first piston 15 accommodated in the first cavity, the first piston 15 can axially move in the first cavity along the extension direction of the spindle 1 to compress the force transmission medium to generate pressure, and the pressure acts on the pressing piece to lock the spindle.

As shown in fig. 9, the first piston 15 divides the first chamber into a first chamber 14, a third chamber 17 and a second chamber 16 which are sequentially away from the middle ring, wherein the second chamber 16 is formed by being recessed from the inside of the first inner cylinder 12, and a force transmission medium is filled therein. Further, the second chamber 16 comprises a passage 161 extending towards said press element 11. In the present invention, the first chamber 14 and the third chamber 17 may be connected to a gas source or a fluid pressure source (e.g. hydraulic pressure), and for example, the first chamber 14 and the third chamber 17 are connected to the gas source, the first piston 15 may be driven by the gas to axially reciprocate along the extending direction of the main shaft 1. While the first chamber 14 may be provided with elastic means, such as springs, at its inner side wall towards the third chamber 17, which springs may be provided with at least one and are distributed axially parallel to the main shaft 1 and around the first piston 15 for releasing the compression of the force transfer medium in the second chamber 16 by the first piston 15, so that the pressing member 11 is restored to release the main shaft 1. The force transfer medium in the second chamber 16, for example, liquid plastic, the first piston 15 moves axially to press the liquid plastic in the second chamber 16, so that the liquid plastic can generate huge pressure instantly, and the pressure can reach hundreds of megapascals.

as shown in fig. 9, the first piston 15 is provided in a split arrangement and includes a first portion 151 located in the first chamber 14 and the third chamber 17 and a second portion 152 located in the second chamber 16 and the third chamber 17. Wherein the first portion 151 is provided with a recess 19 for engaging with an end of the second portion 152, and the recess 19 is capable of restraining an end of the second portion 152. Thus, when the third chamber 17 is inflated by the air source while the first air chamber 14 is vented and the first portion 151 is driven by the air to move in the direction C, the second portion 152 can be pushed by the first portion 151 via the recess 19 to move axially within the second chamber 16, the third chamber 17, so that the second portion 152 can compress the force transfer medium in the second chamber 16 and the first piston 15 can move axially along the main shaft 1 as a whole. Conversely, when the first chamber 14 is inflated by the gas source and the third chamber 17 is exhausted by the gas source, the first portion 151 is driven by the gas in the first chamber 14 to move in the opposite direction of C, the force-transmitting medium in the second chamber 16 is no longer compressed, the force-transmitting medium will elastically return, and when the force-transmitting medium returns, a return pressure will be generated, which in turn will push the second portion 152 and the first portion 151 to move axially to return. Of course, in other embodiments, the first and second portions 151, 152 may be reset solely by the resilient reset force of the force transfer medium without being inflated by the first chamber 14.

As shown in fig. 8 and 9, the first elastic element 10 is a spring housing with a variable diameter, and the radial inner side of the spring housing is tightly sleeved on the main shaft 1, and the radial outer side of the spring housing is tightly arranged against the pressing element 11, so that the pressure resistance of the end surface of the pressing element 11 (referred to as the axial pressure of the main shaft 1 in this embodiment) can be increased, and the pressing element 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 the radial outer side of the pressing member is tightly attached to the wall surface of the first inner cylinder 12. The outer surface of the pressing member 11 is provided with a radially recessed groove 20 for reducing the thickness of the pressing member 11, thereby increasing the deformation capability of the pressing member 11, and the groove 20 communicates with the passage 161 of the first inner cylinder 12. Since the passage 161 is communicated with the second chamber 16, the groove 20, the passage 161, and the second chamber 16 are communicated with each other, and since the second portion 152 of the first piston 15 is accommodated in the second chamber 16, a part of the space of the second chamber 16, the passage 161, and the groove 20 form a closed accommodating chamber, and a certain volume of the force transmission medium is filled in the accommodating chamber. In addition, in order to ensure the sealing performance between the accommodating cavity and the first and third cavities 14 and 17 and prevent the force transmission medium in the accommodating cavity from overflowing to the first and third cavities 14 and 17, at least one sealing ring is respectively arranged between the second portion 152 and the first inner cylinder 12, between the first portion 151 and the first inner and outer cylinders, and between the pressing member 11 and the first inner cylinder 12.

As shown in fig. 8 and 9, when the second portion 152 of the first piston 15 is pushed by the first portion 151 to move toward the direction C, the force transmission medium in the accommodating cavity is compressed to generate a large pressure, the pressure acts on the pressing member 11, the pressing member 11 is deformed after being stressed to extrude the first elastic member 10, and the first elastic member 10 is deformed after being extruded, that is, the diameter of the first elastic member 10 is reduced, so that the first elastic member 10 can clasp the spindle 1, and the first locking mechanism a cannot move axially relative to the spindle 1. In addition, since the pressure generated by compressing the force transmission medium in the second chamber 16 is absorbed by the first elastic member 10 and the pressing member 11 to deform the first elastic member 10 and the pressing member 11, in order to apply the maximum ratio of the pressure generated by compressing the force transmission medium to the main shaft 1, the holding effect is better, and in other practical cases, the main shaft 1 may be held by only the pressing member 11 without the first elastic member 10. When the air source no longer supplies air to the first chamber 14, the pressure generated by the force transmission medium disappears, and the first elastic member 10 and the pressing member 11 recover to their original shapes by virtue of their own elastic forces, so as to release the spindle 1, and the force transmission medium in the second chamber 16 is influenced by the elastic restoring force of the first elastic member 10 and the pressing member 11, and can push the second portion 152 to move axially in the opposite direction of C to push the first portion 151 to move axially in the opposite direction of C, and at the same time, the third chamber 17 can also push the first portion 151 to move axially in the opposite direction of C by virtue of the air pressure, so that the first piston 15 can move axially in the opposite direction of C to recover.

The first and second portions 151 and 152 of the first piston 15 of the present invention may be integrally provided. As shown in fig. 9 in conjunction with fig. 5 and 6, the first and second portions 151 and 152 are integrated into a single body, and the integrated body reciprocates in the first, third, and second chambers 14, 17, and 16.

The present invention also provides an alternative embodiment, as shown in fig. 7 and 10, the first locking mechanism a' includes a first elastic member 10, a pressing member 11 and a first cylinder, which are sequentially arranged around the main shaft 1 from inside to outside. The first cylinder body comprises a first inner cylinder body 12 and a first outer cylinder body 13, and a first cavity extending along the radial direction of 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 accommodated in the first chamber, the first piston 15' being movable in the first chamber in the radial direction of the main shaft 1 by gas drive. The first piston 15 'divides the first cavity into a first chamber (not shown) remote from the main shaft 1 and a second chamber 16' close to the main shaft 1, and the force transfer medium is located in the second chamber 16 ', the second chamber 16' extending towards the press element 11.

Further, the first elastic element 10 is a spring housing with a variable diameter, and the radial inner side of the spring housing is tightly sleeved on the main shaft 1, and the radial outer side of the spring housing is tightly arranged against the pressing element 11, so that the pressure resistance of the end surface of the pressing element 11 (referred to as the axial pressure of the main shaft 1 in the embodiment) can be increased, and the pressing element 11 is 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 the radial outer side of the pressing member is tightly attached to the wall surface of the first inner cylinder 12. The radial outer side of the pressing part 11 is concavely provided with a groove 20 for reducing the thickness of the pressing part 11, so as to increase the deformation capacity of the pressing part 11, the groove 20 is communicated with the second cavity 16 ', the second cavity 16' and the groove 20 form a closed accommodating cavity, and a certain volume of force transmission medium is filled in the accommodating cavity. In order to ensure the sealing property between the accommodating cavity and the first cavity and prevent the force transmission medium in the accommodating cavity from overflowing to the first cavity, at least one sealing ring is arranged between the first piston 15' and the first inner cylinder 12, between the first outer cylinder 13 and between the pressing member 11 and the first inner cylinder 12.

As shown in fig. 7 and 10, when the first piston 15 'moves toward the direction D, the force transmission medium in the second chamber 16' and the groove 20 is compressed to generate a large pressure, the pressure acts on the pressing member 11 and the first elastic member 10 in sequence, the pressing member 11 deforms under force to extrude the first elastic member 10, and the first elastic member 10 deforms under extrusion, that is, the diameter of the first elastic member 10 becomes smaller, so that the first elastic member 10 can clasp the main shaft 1, and the first locking mechanism a does not move axially relative to the main shaft 1. Preferably, in order to improve the holding effect, the first elastic member 10 may not be provided, and the main shaft 1 may be held only by the pressing member 11.

as shown in fig. 1 to 8, the second locking mechanism B includes a second elastic member 30 and a second cylinder 31 sequentially disposed from inside to outside around the outer sleeve 3, and the second cylinder 31 is engaged with two ends of the second elastic member 30, so that the second elastic member 30 does not axially move relative to the second cylinder 31. A second cavity 32 is formed between the second elastic element 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 along the axial direction of 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 semicircular rings, and the two semicircular rings are matched with each other to hold the outer shaft sleeve 3 tightly. The joint of the two semi-circular rings has a gap, and the outer side wall of the gap is in conical fit with the inner side wall of the second piston 33. Since the second elastic member 30 does not axially move relative to the second cylinder 31, when the second piston 33 axially moves toward the middle ring, the tapered surfaces of the two semi-circular rings of the second elastic member 30 are pressed by the tapered surfaces of the second piston 33, and the two semi-circular rings radially move in a direction away from the second cylinder 31, so that the diameter of the second elastic member 30 gradually decreases until the second elastic member tightly holds the outer sleeve 3, and the second locking mechanism B can lock the outer sleeve 3. Since the holding effect of the first locking mechanism a is better than that of the second locking mechanism B, for better tire building effect of the tire building drum, the second locking mechanism B may also adopt the same structure as the first locking mechanism a, specifically see the second locking mechanism B 'in fig. 1 and fig. 2, and the structure of the second locking mechanism B' is not described herein again.

One end of an outer shaft sleeve 3 of the tire building drum 100 is fixedly connected with a first outer cylinder body 13, the other end of the outer shaft sleeve is fixedly connected with a turn-up rod guide disc 8, and a first locking mechanism A or A 'or a second locking mechanism B or B' is used for fixing a connecting piece 6. In this embodiment, the first locking mechanism a or a 'and the second locking mechanism B or B' may be supplied with air by the same air source, the releasing 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 air source or hydraulic source, and the locking control of the first locking mechanism a or a 'and the releasing control of the second locking mechanism B or B' are realized by the same air source or hydraulic source. Specifically, taking the example of the first locking mechanism a interlocking with the second locking mechanism B ', the first locking mechanism a and the second locking mechanism B ' are identical in structure, and the second locking mechanism B ' has a fourth chamber 14 ', a fifth chamber 16-1, and a sixth chamber 17 ' corresponding to the first chamber 14, the second chamber 16, and the third chamber 17, respectively, of the first locking mechanism a, and further has a third piston 15-1 corresponding to the first piston 15 of the first locking mechanism a.

As shown in fig. 9, the sixth chamber 17 ' and the first chamber 14 are supplied with air by the same air source, the third chamber 17 and the fourth chamber 14 ' are supplied with air by the same air source, when the sixth chamber 17 ' and the first chamber 14 are supplied with air, the third chamber 17 and the fourth chamber 14 ' are exhausted, the third piston 15-1 moves towards the direction C to press the fifth chamber 16-1 so as to enable the second locking mechanism B ' to embrace the outer shaft sleeve 3, and the first piston 15 moves towards the direction opposite to the direction C so as to enable the force transmission medium in the second chamber 16 to be elastically restored, so that the first locking mechanism a releases the main shaft 1. On the contrary, when the sixth chamber 17 ' and the first chamber 14 are exhausted, the third chamber 17 and the fourth chamber 14 ' are supplied with air, the third piston 15-1 moves towards the direction opposite to the direction of C to elastically recover the force transmission medium in the fifth chamber 16-1, so that the second locking mechanism B ' releases the outer sleeve 3, and the first piston 15 moves towards the direction of C to press the force transmission medium in the second chamber 16 to enable the first locking mechanism a to tightly hold the main shaft 1.

Therefore, when the first locking mechanism a or a 'locks the spindle 1, the second locking mechanism B or B' can synchronously unlock the outer sleeve 3, and at this time, the lead screw 4 rotates, and the second locking mechanism B or B 'can axially move on the outer sleeve 3, so that the first end 91 of the turnup rod 9 pivoted to the second locking mechanism B or B' can axially move along the spindle 1, and the second end 92 of the turnup rod 9 can perform a turnup action in cooperation with a tire component on the tire building drum 100; when the first locking mechanism A or A 'loosens the main shaft 1, the second locking mechanism or B' B locks the outer shaft sleeve 3 synchronously, and the first locking mechanism A or A ', the second locking mechanism B or B', and the outer shaft sleeve 3 do not move relatively, so that the screw rod 4 can drive the second locking mechanism B or B ', and the outer shaft sleeve 3 to move axially when rotating, thereby driving the first locking mechanism A or A' to move axially, namely the whole half drum to move axially, further adjusting the distance between the two half drums, and matching the tire forming drum 100 to complete the shaping process of the tire component.

The invention has the beneficial effects that:

(1) In the tire building drum, the first locking mechanism is provided with the first cylinder body, the first piston, the first cavity and the second cavity, so that when the first piston is driven by air pressure to move in the first cylinder body, the first piston can compress a force transmission medium of the second cavity, huge pressure is generated instantly after the force transmission medium is compressed, the pressure intensity can reach hundreds of megapascals, the pressure directly acts on the pressing piece, the pressing piece tightly holds the spindle, and therefore under the condition of the same pneumatic driving force, the pressure generated by the linkage structure is larger than the pure air pressure, and the holding effect is better.

(2) In the tire building drum, the distance adjustment and the turn-up boosting action of the two half drums are only matched by a screw nut pair, and are simultaneously completed in a cooperative manner by means of an interlocking device of alternating locking formed by a first locking mechanism and a second locking mechanism, so that the mechanical structure is greatly simplified, the control process is simpler, and the tire building drum can meet the requirements of light weight, simplification and miniaturization.

In the description of the embodiments, discussion of the phrases "in this embodiment," "in one embodiment," "in a particular embodiment," and the like, is intended to mean that a particular feature or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. And in particular embodiments, the schematic representations of the terms used above do not necessarily refer to the same embodiment. Furthermore, the particular features or points described may be combined in any suitable manner in any one or more embodiments.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.