JPH11105156A - Suction device for tire bead part in post-cure inflater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fit the top and bottom bead parts of a tire in an upper die seat ring and a lower die seat ring by providing a suction means which draws at least the upper side bead part of the tire to the upper die seat ring side. SOLUTION: A suction means 3 which draws at least an upper side bead Wa of a tire W to an upper die seat ring 2 side, when internal pressure air Q is filled in the tire W after a vulcanization-molding, is provided. As the suction means 3a, plurality of magnetic bodies 4 are embedded in the peripheral direction of the internal wall surfaces which are confronted with each other of the upper die seat ring 2 and a lower die seat ring 1. When a permanent magnet is used as the magnetic body 4, the number of the magnets which are embedded in the upper die seat ring 2 is made larger than the number of the magnets for the lower seat ring 1, and the magnetic force of the upper die seat ring 2 is made stronger than that of the lower die seat ring 1. As the suction means 3, it may be a suction pad which draws the upper side bead Wa of the tire W to the upper die seat ring 1 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire bead suction device for a post-cure inflator, and more particularly, to an upper seat ring and a lower die for upper and lower bead portions of a tire when filling the tire with internal pressure air. The present invention relates to a suction device for a tire bead portion in a post cure inflator that can be securely fitted to a seat ring.

[0002]

2. Description of the Related Art Conventionally, in a tire molding process, a tire immediately after vulcanization is filled with high-pressure air, expanded, and cooled in this state for a predetermined time (about 1.5 to 1.7 times the vulcanization time). Operation to prevent tire deformation (Po
st Cure inflation). Especially in the case of tire molding using cords with large heat shrinkage (nylon cords, etc.), in order to prevent deformation of the tires due to cord shrinkage due to cooling after vulcanization, the same pressure as in vulcanization is applied immediately after vulcanization. An operation is performed in which the air is charged and left until the temperature drops to a predetermined temperature.

As a conventional method of filling a tire immediately after vulcanization with high-pressure air, a lower bead Wa of a tire W is engaged with a lower seat ring 1 as shown in FIG. By filling the tire W with the high-pressure air Q, the bead portion Wa is lifted upward by the pressure of the high-pressure air Q and fitted to the upper die ring 2.

[0004]

In recent years, as shown in FIG. 8, the tire W
Because the thickness of the sidewall Wz is designed to be thin,
The rigidity of the sidewall Wz tends to decrease, and therefore, the tire W fitted to the upper and lower seat rings 1 and 2 immediately after vulcanization has a lower bead Wa on the upper side because the rigidity of the sidewall Wz is low. Is deformed so as to hang down, and the upper and lower bead portions Wa come into close contact with each other. As a result, the opening H of the tire W becomes narrower than the gap h between the upper seat ring 2 and the introduction of the high-pressure air Q into the tire W becomes impossible, causing the deformation of the product tire.

An object of the present invention is to provide a tire bead in a post-cure inflator capable of securely fitting upper and lower bead portions of the tire to an upper seat ring and a lower seat ring when filling the tire with internal pressure air. It is an object of the present invention to provide a suction device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a suction means for sucking at least the upper bead portion of the tire toward the upper seat ring when filling the tire with internal pressure air. The gist is that. The present invention is configured as described above, and when filling the tire with the internal pressure air, the upper and lower bead portions of the tire are securely fitted to the upper die seat ring and the lower die seat ring to easily apply the internal pressure air to the tire. By being able to be filled, deformation of the product tire can be effectively prevented.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a partially cutaway front view of a lower seat ring 1 embodying the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an upper seat ring 2 embodying the present invention. Front view, partially cut away,
FIG. 4 is a sectional view taken along the line BB in FIG.

In the embodiment of the present invention, when filling the tire W after vulcanization molding with the internal pressure air Q, the suction means 3 for sucking at least the upper bead Wa of the tire W toward the upper mold seat ring 2 is provided. It is provided. As shown in FIG. 1 to FIG. 4, the suction means 3 includes, in the circumferential direction of the inner wall surfaces of the upper die ring 2 and the lower die ring 1 opposed to each other,
A plurality of magnetic bodies 4 are embedded.

When a permanent magnet is used as the magnetic body 4, the number of magnets buried in the upper seat ring 2 is reduced in order to facilitate removal of the tire W after cooling.
(For example, when magnets having the same magnetic force are used, the number of magnets to be embedded in the upper mold seat ring 2 is 8, and the number of the lower mold seat ring 1 is 4 at equal intervals, respectively). (Buried), the magnetic force of the upper seat ring 2 is configured to be stronger than that of the lower seat ring 1.

When an electromagnet is used as the magnetic material 4, the tire W after cooling is easily removed from the mold.
The number of the upper mold seat ring 2 and the number of the lower mold seat ring 1 may be the same, or only the upper mold seat ring 2 may be provided. Further, as another embodiment of the suction means 3, as shown in FIG. 6, it is possible to use a suction pad 5 for sucking the upper bead portion Wa of the tire W to the upper seat ring 1 side and pressing the same. is there.

As described above, when filling the tire W with the internal pressure air Q, the upper and lower bead portions Wa of the tire W are moved in the circumferential direction of the inner wall surfaces of the upper die ring 2 and the lower die ring 1 facing each other. By attracting and fitting by the magnetic force of a plurality of embedded magnetic bodies 4 (permanent magnets or electromagnets),
Tire W is attached to the upper seat ring 2 and the lower seat ring 1.
The upper and lower bead portions Wa are securely fitted so that the tire W can be easily filled with the internal pressure air.

In the second embodiment shown in FIG. 6, the suction means 3 uses suction pads 5 instead of the plurality of magnetic bodies 4 to move the upper bead Wa of the tire W to the upper seat ring 1 side. By pulling up, the upper and lower bead portions Wa of the tire W are securely fitted to the upper die ring 2 and the lower die ring 1 so that the tire W can be easily filled with the internal pressure air.

[0013]

According to the present invention, when the tire is filled with the internal pressure air as described above, the suction means for sucking at least the upper bead portion of the tire toward the upper die ring is provided. The part can be securely fitted to the upper and lower seat rings, and as a result, deformation of the product tire can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a lower mold seat ring embodying the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partially cutaway front view of an upper seat ring embodying the present invention.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

FIG. 5 shows a first embodiment of the present invention using a magnetic material as the suction means.
It is operation | movement explanatory drawing of embodiment.

FIG. 6 is an operation explanatory view of a second embodiment using a suction pad as suction means.

FIG. 7 is an explanatory diagram when a conventional tire is filled with internal pressure air.

FIG. 8 is an explanatory diagram of a conventional tire having a small thickness of a sidewall portion when filled with internal pressure air.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower-type seat ring 2 Upper-type seat ring 3 Suction means 4 Magnetic material 5 Suction pad W Tire Q Internal pressure air Wa Upper side bead portion

Claims (5)

[Claims] 1. A tire vulcanized by a vulcanizer is fitted to a pair of upper and lower upper and lower seat rings, and in this state, the tire beads are filled with internal pressure air and the tire bead portion is connected to the upper and lower seat rings. In a suction device for a tire bead portion in a post cure inflator that cools a tire for a predetermined time by pressing the tire, when filling the tire with internal pressure air, suction for sucking at least an upper bead portion of the tire toward an upper seat ring side. A suction device for a tire bead portion in a post cure inflator provided with a means. 2. The suction device for a tire bead portion in a post-cured inflator according to claim 1, wherein the suction means is a plurality of magnetic materials buried in a circumferential direction on inner wall surfaces of the seat ring opposed to each other. 3. The magnetic recording medium according to claim 1, wherein when a permanent magnet is used as the magnetic material, the number of magnets embedded in the upper mold seat ring is larger than the number of the lower mold ring to increase the magnetic force. Suction device for tire bead part in post cure inflator. 4. The suction device for a tire bead portion in a post cure inflator according to claim 1, wherein when an electromagnet is used as the magnetic material, the magnet material is embedded at least in an upper mold seat ring. 5. The suction device for a tire bead portion in a post-cured inflator according to claim 1, wherein the suction means is a suction pad for sucking an upper bead portion of the tire toward an upper seat ring and pressing the tire.