JP2003260711A - Method for bead lock of tire in tire vulcanizing apparatus and apparatus for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for bead lock of a tire in a tire vulcanizing apparatus by which a tire with a high roundness can be vulcanized and molded and performance of tire uniformity can be improved, and an apparatus for it. <P>SOLUTION: An upper part fixed plate 13 always energized to a bladder clamp ring 9 side through an elastic member 12 is slidably fitted to a center shaft 8 between a lower part fixed plate 5 and the bladder clamp ring 9 in a bladder. Pairs of base end parts of approximately L-shaped lower part clamp nails 14a and upper part clamp nails 14b are fitted so as to be freely revolving in the up and down direction at specified intervals in the peripheral direction at a plurality of positions facing each other on the peripheral edge parts of the lower part fixed plate 5 and the upper part fixed plate 13 and are rotatably connected by link arms 18 through pins 17 at the intermediate parts between pairs of the upper part clamp nails 14b and the lower part clamp nails 14a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire bead lock method and apparatus in a tire vulcanizing apparatus, and more particularly, to accurately clamp-lock the center position of an unvulcanized tire during vulcanization molding of the tire. TECHNICAL FIELD The present invention relates to a tire bead lock method and a tire vulcanization apparatus capable of vulcanizing and molding a tire having a high roundness.

[0002]

2. Description of the Related Art Conventionally, in a tire vulcanizing apparatus, an unvulcanized tire (green tire) held by a tire inserting apparatus is inserted from the upper part of a bladder center mechanism, and a lower mold (fixed on a base plate ( (Including lower bead ring)
The beads of the unvulcanized tire were engaged with and held by the bead holding part of No. 1 to position, and internal pressure was applied to the bladder provided in the bladder center mechanism to center the unvulcanized tire.

After this step, the upper mold (including the upper bead ring) and the bladder clamp ring of the bead center mechanism are engaged and housed in the vulcanizing mold to vulcanize the unvulcanized tire. Was going on.

[0004]

However, in the vulcanization process as described above, the unvulcanized tire is configured to be positioned by the lower mold, but when the internal pressure is applied to the bladder, There may be problems such as the center position of the upper and lower bead parts deviating due to the bulging and accuracy of the unvulcanized tire, especially the bead splice, which causes the center of the tire bead part and the center of the unvulcanized tire to shift. There is a problem that it deteriorates the tire uniformity, which is one of the tire performances.

The present invention focuses on such conventional problems,
The bead lock of the tire in the tire vulcanizing device that can accurately lock the tire bead to the center position of the unvulcanized tire, vulcanize and mold the tire with high roundness, and improve the performance of the tire uniformity It is an object of the present invention to provide a method and an apparatus thereof.

[0006]

In order to achieve the above object, the present invention provides a tire bead lock method, comprising:
The lower mold bead ring fixed on the base plate and the center of the bladder center mechanism provided at the center of the lower fixing plate are inserted from the upper part of the unvulcanized tire held by the tire inserting device and lowered, and the unvulcanized The lower bead part of the tire is engaged with the holding part of the lower bead ring, and in this state, while applying internal pressure to the bladder arranged around the center shaft of the bladder center mechanism, the center shaft and the upper fixing plate And lower the lower clamp plate to rotate a plurality of lower clamp pawls arranged in the circumferential direction to clamp lock the lower bead portion of the unvulcanized tire to the holding portion of the lower bead ring through the bladder. Then, after releasing the unvulcanized tire from the tire inserting device, the tire inserting device is retracted to a predetermined position, and then the upper mold The upper ring of the unvulcanized tire is brought into contact with the holding portion of the upper bead ring by lowering the dring, and the center shaft of the bladder center mechanism is further lowered in this state to hold the upper fixing plate by the elastic member. At the same time as lowering, while lowering the upper bead portion of the unvulcanized tire while pressing the upper bead ring, the lower bead ring and the upper bead arranged concentrically with the upper and lower bead portions of the unvulcanized tire. At the same time as engaging with the ring, a plurality of upper clamp claws arranged in the circumferential direction of the upper fixing plate are swung to a holding portion of the upper bead ring through a bladder to a lower bead of an unvulcanized tire. The gist is to clamp-lock the part.

At the same time when the upper and lower beads of the unvulcanized tire are clamped, a predetermined internal pressure is introduced into the bladder to hold the green tire.

As described above, the lower bead portion of the unvulcanized tire is clamp-locked with respect to the center of the unvulcanized tire, and then the upper bead portion is clamp-locked with the tire. The bead can be locked accurately and a tire with high roundness can be vulcanized and molded.

Further, the tire bead lock device of the present invention comprises a lower fixing plate fixed on a base plate, and a bladder clamp ring attached to the tip of a vertically movable center shaft of a bladder center mechanism in a substantially cylindrical shape. The upper and lower ends of the formed bladder are fixed, and the center shaft between the lower fixing plate and the bladder clamp ring in the bladder is always urged to the bladder clamp ring side via an elastic member. Are slidably fitted to each other, and the base end portions of the pair of lower clamp claws and upper clamp claws are circumferentially spaced apart at predetermined positions at opposite positions of the peripheral edges of the lower and upper clamp plates. Is rotatably mounted in the vertical direction, and an intermediate portion between the pair of upper and lower clamp claws and the lower clamp claw is connected via a link arm. The pair of upper clamp claws and the lower clamp claws are respectively swung outward by lowering the center shaft to which they are rotatably connected and to which the bladder clamp ring is attached, so that the bead portion of the tire is passed through the bladder. The gist is that it is clamp-locked.

The length of the link arm is arbitrarily set so that the bead clamping force between the pair of upper and lower clamp pawls and the lower clamp pawl is maximized, and the link arm or the upper clamp pawl and the lower clamp pawl are At least one of them can be provided with a stopper for preventing damage to the link arm. Further, at least three sets or more of the pair of upper clamp claws and lower clamp claws are provided.
It is arranged below the set.

As described above, since the bead lock mechanism is provided by using the conventional bladder and the bladder center mechanism as they are, it is cheaper than the case of manufacturing a new device, and the mechanism is relatively simple. It can also be applied to a tire vulcanizer that does not use a bladder.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a bead lock device for carrying out a tire bead lock method in a tire vulcanization device embodying the present invention. The center line X--X right side is before bead lock (before clamping). And the centerline X-X left side shows the state after bead lock (after clamping).

On the base plate 2 of the support base 1 of the bead lock device, a lower bead ring 4 having a through hole 3 in the center and a lower fixing plate 5 are fixed by fastening members such as bolts, and the through holes are formed. In the hole 3, the support 1
A vertically movable center shaft 8 of a bladder center mechanism 7 is installed via an elevating means 6 such as a cylinder fixed to.

At the tip of the center shaft 8 of the bladder center mechanism 7, a bladder clamp ring 9 is attached to the bolt 1.
0 is fixed horizontally, and the bladder clamp ring 9, the lower bead ring 4 and the lower fixing plate 5 are fixed.
The upper and lower end portions 11a of the bladder 11 formed in a substantially cylindrical shape are fixed to and.

Lower fixing plate 5 in the bladder 11
The center shaft 8 between the bladder clamp ring 9 and the bladder clamp ring 9 is slidably fitted with an upper fixing plate 13 constantly urged toward the bladder clamp ring 9 side through an elastic member 12 such as a compression spring. There is.

On the peripheral portions of the lower fixing plate 5 and the upper fixing plate 13, a pair of lower clamp claws formed in a pair of substantially L-shapes at predetermined positions in the circumferential direction at predetermined intervals. 14a and the upper end portion of the upper clamp claw 14b are attached so as to be pivotable in the vertical direction via a mounting plate 15 and a pin 16, and at the intermediate portion between the pair of upper and lower clamp claws 14b and 14a. Are rotatably connected by a link arm 18 via a pin 17.

In this embodiment, the pair of upper and lower clamp claws 14b and 14a are provided at twelve positions on the periphery of the lower fixing plate 5 and the upper fixing plate 13, as shown in FIG. Although 12 sets are provided in a radial pattern, the number and arrangement are not particularly limited, and considering the function of clamping with a uniform clamping force in the circumferential direction, it is 3 sets or more, and a maximum of 36 unless mechanically complicated. Up to a set is possible.

The tips 19 of the upper clamp claw 14b and the lower clamp claw 14a are formed in an arcuate concave surface so that the arcuate bead portion Wa of the unvulcanized tire W can be easily clamped.

The length of the link arm 18 is such that a pair of upper and lower clamp pawls 14b and lower clamp pawls 14a are provided.
It is arbitrarily set so that the bead clamp force between the upper and lower clamp claws 14b and 14b may be maximized, and further fixed to at least one of the link arm 18 or the upper clamp claw 14b and the lower clamp claw 14a, or as shown in FIG. Plate 5
It is also possible to provide rod-shaped stoppers 22 between the upper fixing plate 13 and the upper fixing plate 13 at several positions in the circumferential direction (three at equal intervals in this embodiment) for preventing damage to the link arms 18.

Next, a tire bead lock method will be described with reference to FIGS. 1, 3 and 4.

First, from the state before the bead lock (before clamping) on the right side of the center line XX in FIG. 1, the bladder provided at the center of the lower bead ring 4 and the lower fixing plate 5 fixed on the base plate 2. The unvulcanized tire W held by a tire insertion device (not shown) is inserted from the center of the central mechanism 7 and lowered.

Then, the lower bead portion Wa of the unvulcanized tire W is engaged with the holding portion 4a of the lower mold bead ring 4, and in this state, it is arranged around the center shaft 8 of the bladder center mechanism 7. While supplying a pressurized fluid from a pressurized fluid supply means (not shown) to the inside of the bladder 11, the center shaft 8 and the upper fixing plate 1 are applied.
3 is lowered via the elevating means 6, and a plurality of lower clamp claws 14 arranged in the circumferential direction of the lower fixing plate 5 are provided.
By rotating a, the lower bead portion Wa of the unvulcanized tire W is clamp-locked to the holding portion 4a of the lower mold bead ring 4 through the bladder 11.

Then, after releasing the upper portion of the unvulcanized tire W from a tire inserting device (not shown), the tire inserting device is retracted to a predetermined position. From this state, the upper mold bead ring 20 attached to the movable plate 21 is lowered to bring the upper bead portion Wa of the unvulcanized tire W into contact with the holding portion 20a of the upper mold bead ring 20. Sulfur tire W
Holding portions 4a, 20a for holding a lower bead ring 4 and an upper bead ring 20 in which the upper and lower bead portions Wa are concentrically arranged.
Engage with.

Further, the center shaft 8 of the bladder center mechanism 7 is lowered to lower the upper fixing plate 13 held by the elastic member 12, and at the same time, the upper bead ring 20 is used to move the upper bead portion of the unvulcanized tire W. Hold down Wa and lower.

Then, a plurality of upper clamp claws 14b arranged in the circumferential direction of the upper fixing plate 13 are swung so that the unvulcanized tire W is held on the holding portion 20a of the upper mold bead ring 20 via the bladder 11. The lower bead portion Wa is clamp-locked.

That is, by the lifting means 6 such as a cylinder,
When the bladder clamp ring 9 is lowered together with the center shaft 8 and the upper fixing plate 13 is further lowered against the elastic force of the elastic member 12, the lower clamp claw 1 connected to the upper clamp claw 14b via the link arm 18 is formed.
4a swivels toward the inner wall surface side of the bladder 11 with the pin 16 as a fulcrum, and while the bladder 11 is deformed, the lower bead portion Wa of the unvulcanized tire W is held by the lower mold bead ring 4 as shown in FIGS. 3 and 4. The portion 4a is pressed and locked.

Then, when the center shaft 8 is further lowered, this time the link arm 18 held in the vertical state.
The upper clamp claw 14b pivots to the inner wall surface side of the bladder 11 with the pins 17 and 16 at the upper end of the bladder 11 as fulcrums, and the upper bead portion of the unvulcanized tire W is deformed while deforming the bladder 11, as shown in FIGS. 3 and 4. Wa is the upper bead ring 20
The holding portion 20a is pressed and locked.

The upper and lower beads W of the unvulcanized tire W
At the same time when the clamping of a is completed, a predetermined internal pressure is introduced into the bladder 11 to hold the green tire.

As described above, since the lower bead portion Wa of the unvulcanized tire W is clamp-locked with respect to the center of the unvulcanized tire W, the upper bead portion Wa is clamp-locked with the center of the unvulcanized tire W. Tire bead W for position
A can be accurately locked, and a tire with high roundness can be vulcanized and molded.

Further, with this structure, it can be applied to a tire vulcanizer not using the bladder 11, and an excellent effect for vulcanizing a high performance tire can be exhibited.

[0032]

Since the present invention is constructed as described above, it has the following excellent effects. (a) .Because the lower bead of the unvulcanized tire is clamp-locked with respect to the center of the unvulcanized tire, the upper bead is clamp-locked, so the tire bead is accurately aligned with the center of the unvulcanized tire. It is possible to lock the tire to the vulcanization and to vulcanize a tire with high roundness. (b) .Beadlock mechanism is provided as a structure that uses the conventional bladder and bladder center mechanism as it is, so it is cheaper than the case of manufacturing a new device, and the mechanism is relatively simple. Not applicable to tire vulcanizer. (c). It can also exert an excellent effect on vulcanization of high performance tires.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bead lock device for carrying out a tire bead lock method in a tire vulcanization device embodying the present invention, in which the right side of the center line XX is a state before bead lock (before clamping), The left side of the center line XX shows the state after bead lock (after clamping).

FIG. 2 is an AA of FIG. 1 showing an arrangement state of upper clamp claws.
FIG.

FIG. 3 is a sectional view showing a bead clamp state by a bladder center mechanism.

FIG. 4 is a cross-sectional view showing a bead unclamped state by a bladder center mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Support stand 2 Base plate 3 Through hole 4 Lower bead ring 5 Lower fixing plate 6 Elevating means 7 Bladder center mechanism 8 Center shaft 9 Bladder clamp ring 10 Bolt 11 Bladder 11a Upper and lower end 12 Elastic member 13 Upper fixing plate 14a Lower clamp claw 4a Holding part 14b Upper clamp claw 15 Mounting plate 16 pin 17 Pin 18 Link arm 19 Tip part 20 Upper bead ring 20a Holding part 21 Movable plate 22 Stopper W Unvulcanized tire Wa bead part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mekazu Seko             2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd.             Ceremony Company Hiratsuka Factory F-term (reference) 4F202 AH20 CT02 CU12 CV09 CV12                 4F203 AH20 DA11 DB01 DC01 DL12                       DN21

Claims (6)

[Claims] 1. A center of an unvulcanized tire held by a tire inserting device is inserted and lowered from an upper portion of a bladder center mechanism provided at a central portion of a lower bead ring fixed on a base plate and a lower fixing plate. , The lower bead portion of the unvulcanized tire is engaged with the holding portion of the lower mold bead ring, and in this state, while applying internal pressure to the bladder arranged around the center shaft of the bladder center mechanism, The shaft and the upper fixing plate are lowered, and a plurality of lower clamp claws arranged in the circumferential direction of the lower fixing plate are swung, and the lower portion of the unvulcanized tire is attached to the holding portion of the lower mold bead ring through the bladder. After the bead is clamped and locked, and then the unvulcanized tire is released from the tire insertion device, the tire insertion device is retracted into place and After that, the upper bead ring is lowered to bring the upper bead portion of the unvulcanized tire into contact with the holding portion of the upper bead ring, and in this state, the center shaft of the bladder center mechanism is further lowered to use an elastic member. At the same time as lowering the held upper fixed plate, lowering the upper bead portion of the unvulcanized tire while pressing the upper bead portion of the unvulcanized tire with the upper die bead ring, the lower die concentrically arranged with the upper and lower bead portions of the unvulcanized tire. At the same time as engaging the bead ring and the upper bead ring, a plurality of upper clamp claws arranged in the circumferential direction of the upper fixing plate are swiveled so that the upper bead ring is not held in the holding portion via the bladder. A method of bead-locking a tire in a tire vulcanizing device, characterized in that a lower bead portion of a vulcanized tire is clamp-locked. 2. The bead lock of a tire in a tire vulcanizing apparatus according to claim 1, wherein a predetermined internal pressure is introduced into the bladder to hold the green tire at the same time when the upper and lower beads of the unvulcanized tire are clamped. Method. 3. An upper and lower end portion of a bladder formed in a substantially cylindrical shape is fixed to a lower fixing plate fixed on a base plate and a bladder clamp ring attached to the tip of a vertically movable center shaft of a bladder center mechanism. Then
The center shaft between the lower fixing plate in the bladder and the bladder clamp ring is slidably fitted with an upper fixing plate constantly urged to the bladder clamp ring side through an elastic member to fix the lower fixing The base end portions of the pair of lower clamp claws and the upper clamp claws are vertically rotatably attached to the peripheral portions of the plate and the upper fixed plate at positions facing each other at predetermined intervals in the circumferential direction,
An intermediate portion between the pair of upper and lower clamp claws and a lower clamp claw is rotatably connected to each other via a link arm, and a center shaft having the bladder clamp ring is lowered to lower the pair of upper clamp claws. A bead lock device for a tire in a tire vulcanizing device, wherein a bead portion of a tire is clamp-locked through a bladder by pivoting an outer ring and a lower clamp claw outwardly. 4. The tire in a tire vulcanizing apparatus according to claim 3, wherein the length of the link arm is arbitrarily set so that the bead clamping force between the pair of upper and lower clamp claws and the lower clamp claw is maximized. Bead lock device. 5. A stopper for preventing damage to the link arm is provided on at least one of the link arm or the upper clamp claw and the lower clamp claw.
A bead lock device for a tire in the tire vulcanizing device according to. 6. The bead lock device for a tire in a tire vulcanizing apparatus according to claim 3, 4 or 5, wherein at least 3 sets and 36 sets or less of the pair of upper clamp claws and lower clamp claws are arranged.